1. Prerequisite Skills SKILL CHECK Name: ______________Date: _______________ ____ hr MathMC2 Ch 2 Decimals NameDate _hr Mathsource NameDate _hr Mathsource

2. Prerequisite Skills SKILL CHECK PLACE VALUE Name: ______________Date: _______________ ____ hr MathMC2 Ch 2 pgs 54-55 Decimals: Ordering, comparing, & rounding NameDate _hr Mathsource ROUNDING: When Rounding: 0, 1, 2, 3, 4, stays the same 5, 6, 7, 8, 9 rounds up Every empty place after where you rounded to becomes a ZERO

3. Prerequisite Skills SKILL CHECK PLACE VALUE Name: ______________Date: _______________ ____ hr MathMC2 Ch 2 pgs 54-55 Decimals: Ordering, comparing, & rounding NameDate _hr Mathsource Comparing: When Comparing: 1 st list the numbers lining up the decimal points 2 nd write ZEROS as place holders so that #s have the same # of digits 3 rd then compare digits from left to right

4. Prerequisite Skills SKILL CHECK Round the number to the place value of the red digit. 4. 845 ANSWER 850 5. 12,0.47 6. 739.022 739.000 ANSWER 100.00 ANSWER 7. 299.3438 300.0000 ANSWER

5. Prerequisite Skills Olympic Games EXAMPLE 1 Comparing Decimals To determine which race time given above is faster, compare 22.5 and 22.05. In the 1968 Summer Olympics, Irena Szewinska of Poland won the women’s 200 meter dash with a time of 22.5 seconds. In 2004, Veronica Campbell of Jamaica won the event with a time of 22.05 seconds. Whose time is faster? 22.50 22.05 The tens’ and ones’ digits are the same. Write a zero as a placeholder. The tenths’ digits are different. 5 > 0, so 22.50 > 22.05.

6. Prerequisite SkillsEXAMPLE 1 ANSWER Because 22.5 > 22.05, Veronica Campbell’s time is faster. Comparing Decimals

7. Prerequisite Skills GUIDED PRACTICE for Example 1 Copy and complete the statement using, or =. 1. 30.12 ? 30.4 ANSWER < 2. 7.7 ? 7.70 ANSWER = 3. 5.701 ? 5.699 ANSWER >

8. Prerequisite Skills SOLUTION EXAMPLE 2 Ordering Decimals Order 2.11, 2.21, 2, 2.06, and 2.24 from least to greatest. On a number line, mark tenths between 2.0 and 2.3. Mark hundredths by dividing each tenth into ten equal parts. Then graph each number. From least to greatest, the numbers are 2, 2.06, 2.11, 2.21, and 2.24. ANSWER

9. Prerequisite Skills SOLUTION EXAMPLE 3 Rounding a Decimal Round 7.126 to the nearest tenth. 7.126 ANSWER The decimal 7.126 rounded to the nearest tenth is 7.1. Because the hundredths’ digit is less than 5, round down and drop the remaining digits. You want to round to the nearest tenth.

10. Prerequisite Skills GUIDED PRACTICE for Examples 2 and 3 Order the numbers from least to greatest. 4. 3.84, 4.4, 4.83, 3.48, 4.38 3.48, 3.84, 4.38, 4.4, 4.83 ANSWER 5. 5.71, 5.8, 5.68, 5.79, 5.6 5.6, 5.68, 5.71, 5.79, 5.8 ANSWER

11. Prerequisite Skills GUIDED PRACTICE Round the number to the nearest hundredth. 6. 34.0152 34.02 ANSWER 7. 1.5034 1.50 ANSWER 8. 22.6654 22.67 ANSWER 9. 125.7049 125.70 ANSWER for Examples 2 and 3

12. Prerequisite Skills VOCABULARY CHECK Copy and complete using a review word from the list below. dividend, divisor, quotient ANSWER round 1. In the division equation 42 6 = 7, 42 is called the ?, 6 is called the ?, and 7 is called the ?. 2. If you ? 1723 to the nearest hundred, you get 1700. digitnumber lineless thangreater than rounddividenddivisorquotient estimate

13. Prerequisite Skills ANSWER digit 3. The ? in the tens’ place of the number 637 is 3. Copy and complete using a review word from the list below. digitnumber lineless thangreater than rounddividenddivisorquotient estimate VOCABULARY CHECK

14. Prerequisite Skills Estimate the sum or difference. ANSWER 1900 13,987 + 32,053 9. 54,036 ANSWER 100,000 8. 905 782 + 179 SKILL CHECK

15. Prerequisite Skills Estimate the sum or difference. 10. 2874 – 1951 ANSWER 1000 11. 26,780 – 17,702 ANSWER 9000 SKILL CHECK

16. Prerequisite Skills ANSWER 56 ANSWER 10 12. 14 + 6 7 13. 12 2 + 4 Evaluate the expression. ANSWER 33 5252 14. 2 4 + 15. 5 – 2 2 ANSWER 1 SKILL CHECK