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**Welcome to Math with Mrs. Cross**

M6 A and A.3.1.3 Practice place value while you wait:

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What we know… - Rounding Rap

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Rounding Rap Yo, this is a story all about how My math got twisted upside down, I’d like to take a minute so sit right here I’ll tell you how I got from here to there. First find the place, okay get it Arrow to the right, underline the digit, 5 or above, give it a shove-- 4 or less, stay at rest. Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And that’s how its done in the rounding game! PEACE OUT!!

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Estimation is ... Estimation is finding a number that is close enough to the right answer. You are not trying to get the exact right answer What you want is something that is good enough (usually in a hurry!)

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**When to use rounding… When the question asks you to estimate.**

When the question asks “about how many”…? When an exact answer isn’t possible. When an answer is difficult to obtain.

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Rounding Numbers Numbers 1 – 4 = ROUND DOWN Numbers 5 – 9 = ROUND UP

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**Rounding Numbers Numbers 1 – 4 = ROUND DOWN Numbers 5 – 9 = ROUND UP**

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**9 1 2 , 4 3 6 , 7 8 2, 0 5 1 Place Value ones tens billions thousands**

hundreds ten billions ten millions millions ten thousands hundred billions hundred millions hundred thousands

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**Watch me: Round to the nearest tens place:**

First find the place, okay get it 4 7 Circle the number in the tens place.

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**Round to the nearest tens place:**

Arrow to the right, underline the digit, 4 7 Draw an arrow to the right of the number. Underline.

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**Round to the nearest tens place:**

5 or above, give it a shove-- 4 or less, stay at rest. 4 7

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**Round to the nearest tens place:**

5 or above, give it a shove-- 4 or less, stay at rest. 4 7 Add 1 to the tens place.

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**Round to the nearest tens place:**

Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And that’s how its done in the rounding game! 47 = _____

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**47 rounded to the nearest tens place is 50**

The Answer 47 rounded to the nearest tens place is 50 47 50 40 Note 47 is closer to 50 on the number line.

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**Round to the nearest thousands place:**

First find the place, okay get it 3, 2 5 9 Circle the number in the thousands place.

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**Round to the nearest tens place:**

Arrow to the right, underline the digit, 3, 2 5 9 Draw an arrow to the right of the number. Underline.

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**Round to the nearest tens place:**

5 or above, give it a shove-- 4 or less, stay at rest. 3, 2 5 9 2 shows us to do what?

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**Round to the nearest tens place:**

5 or above, give it a shove-- 4 or less, stay at rest. 3, 2 5 9 2 should stay at rest

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**Round to the nearest tens place:**

Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And that’s how its done in the rounding game! 3,259 = _______

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**3,259 rounded to the nearest thousands place is 3,000**

The Answer 3,259 rounded to the nearest thousands place is 3,000 3,259 4,000 3,000 Note 3,259 is closer to 3,000 on the number line.

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**Round these numbers to the nearest ten.**

1) 256 = 2) 39 = 3) = 4) 956 = 5) = 6) 344 = 260 40 7680 960 1230 340

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**Round these numbers to the nearest hundreds.**

1) 256 = 2) = 3) 76,982 = 4) 956 = 5) = 6) 344 = 300 3100 77,000 1,000 1200

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**Round these numbers to the nearest thousands.**

1) = 2) 32,109 = 3) 76,982 = 4) = 5) = 6) = 1000 32,000 77,000 4,000 1,000 3,000

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**Name the hundreds each is between**

516 809 447 782 124 450 500 and 600 800 and 900 400 and 500 700 and 800 100 and 200

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**Name the tens each is between**

84 33 58 91 23 15 80 and 90 30 and 40 50 and 60 90 and 100 20 and 30 10 and 20

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**Name the thousands each is between**

4,309 6,500 2,833 5,432 1,875 3,598 4000 and 5000 6000 and 7000 2000 and 3000 5000 and 6000 1000 and 2000 3000 and 4000

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**Rounding to a Certain Place Value**

Estimate by rounding to the nearest ten. What numbers should you use to estimate ? THINK: Which is the nearest ten for 33? Which is the nearest ten for 37? = 70

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**Estimate by rounding to the nearest ten**

Estimate by rounding to the nearest ten. What numbers should use to estimate ? A B C D D

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**Round each number to the nearest ten and then add. 1,357 + 729 A**

Round each number to the nearest ten and then add. 1, A. 2,000 B. 1,700 C. 2, 090 D. 2, 100 C

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**Round each number to the nearest ten, and then solve.**

= 32 – 12 = = 68 – 22 = = 88 – 54 =

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Nearest Hundred

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**Nearest Hundred Round each number to the nearest hundred and then add.**

,964 = A. 3,400 B. 4,100 C. 4,300 D. 4,000 C

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**Estimate by rounding to the nearest hundred. **

What numbers should you use to estimate 641 plus 378? A B C D B

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**Round each number to the nearest hundred, and then solve.**

= 392 – 182 = = 648 – 322 = = 858 – 524 =

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Which of the following should you use to estimate 5,789 – 4,678 to the nearest thousand? A. 5,000 –5,000 B. 6,000- 5,000 C. 6,000-4,000 D. 5,700-4,700 B

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**Round each number to the nearest thousand and then subtract**

Round each number to the nearest thousand and then subtract. 7,345 – 3,446 A. 4,000 B. 3,000 C. 5,000 D. 2,000 A

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**Round each number to the nearest thousand, and then solve.**

4, ,257 = 4,832 – 1,222 = 4, ,465 = 8,642 – 2,468 = 9, ,833 = 8,478 – 1,454 =

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**Estimation Remember Estimation is not an exact answer**

It should be around the answer, but not exactly it. Round the numbers first, then calculate. Use Mental Math and Rounding to make numbers easier to work with.

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