Round to Nearest 10 and 100 Copyright © 2013 Kelly Mott

FOCUS QUESTION: What does it mean to round a number? Copyright © 2013 Kelly Mott

When you round a number, you are replacing it with another number that tells about how much or how many. You’re saying what the number is closest to. Copyright © 2013 Kelly Mott

Here are some examples. Copyright © 2013 Kelly Mott

What is 13 rounded to the nearest ten? Find 13 on the number line. Put a dot. Is 13 closer to 10 or 20? __________________ Answer: 13 rounded to the nearest ten is ____ Copyright © 2013 Kelly Mott Round to the Nearest Ten

What is 19 rounded to the nearest ten? Find 19 on the number line. Put a dot. Is 19 closer to 10 or 20? __________________ Answer: 19 rounded to the nearest ten is ____ Copyright © 2013 Kelly Mott Round to the Nearest Ten

Does this make sense? Copyright © 2013 Kelly Mott

Now let’s try rounding some numbers to the nearest 10. Copyright © 2013 Kelly Mott

Practice # 1: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 23 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 2: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 36 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 3: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 41 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 4: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 19 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 5: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 68 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 6: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 74 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 7: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 25 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 8: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 52 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Does this make sense? Copyright © 2013 Kelly Mott

Now let’s try rounding some harder numbers to the nearest 10. Copyright © 2013 Kelly Mott

Practice # 1 STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 139 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 2 STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 653 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 3 STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 376 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 4 STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 521 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 5 STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest ten: 842 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Does this make sense? Copyright © 2013 Kelly Mott

Let’s try rounding some numbers to the nearest 100. Copyright © 2013 Kelly Mott

Practice # 1: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest thousand: 4,833 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 2 : STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest thousand: 6,117 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 3: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest thousand: 7,438 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 4 : STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest thousand: 3,872 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 5: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest thousand: 5,306 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Does this make sense? Copyright © 2013 Kelly Mott

Now let’s try rounding some harder numbers to the nearest 100. Copyright © 2013 Kelly Mott

Practice # 1: STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest hundred: 34,833 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 2: STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest hundred: 13,285 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 3: STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest hundred: 26,435 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 4: STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest hundred: 78,409 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Practice # 5: STEPS: 1.Underline the place you are rounding to. 2.Write down the number(s) to the left of the underlined digit. 3.Circle the number to the right. 4.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 5.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 6.Every number to the right of the underlined number becomes a zero. Copyright © 2013 Kelly Mott Round to the nearest hundred: 54,072 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

Does this make sense? Copyright © 2013 Kelly Mott

FOCUS QUESTION: When might you use rounding in everyday life? Copyright © 2013 Kelly Mott