SKILL CHECK

1. Name Date _hr Math source Name Date _hr Math source SKILL CHECK Name: ______________ Date: _______________ ____ hr Math MC2 Ch 2 Decimals

2. Name Date _hr Math source SKILL CHECK Name: ______________ Date: _______________ ____ hr Math MC2 Ch 2 pgs 54-55 Decimals: Ordering, comparing, & rounding PLACE VALUE • 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. Name Date _hr Math source SKILL CHECK Name: ______________ Date: _______________ ____ hr Math MC2 Ch 2 pgs 54-55 Decimals: Ordering, comparing, & rounding PLACE VALUE • Comparing: • When Comparing: • 1st list the numbers lining • up the decimal points • 2nd write ZEROS as place • holders so that #s have the • same # of digits • 3rd then compare digits from • left to right

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

5. The tens’ and ones’ digits are the same. 22.50 Write a zero as a placeholder. 22.05 The tenths’ digits are different. 5 > 0, so 22.50 > 22.05. EXAMPLE 1 Comparing Decimals Olympic Games 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? To determine which race time given above is faster, compare 22.5 and 22.05.

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

7. ANSWER ANSWER ANSWER < = > for Example 1 GUIDED PRACTICE Copy and complete the statement using <, >, or =. 1.30.12 ? 30.4 2.7.7 ? 7.70 3.5.701 ? 5.699

8. ANSWER From least to greatest, the numbers are 2, 2.06, 2.11, 2.21, and 2.24. EXAMPLE 2 Ordering Decimals Order 2.11, 2.21, 2, 2.06, and 2.24 from least to greatest. SOLUTION 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.

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

10. ANSWER 3.48, 3.84, 4.38, 4.4, 4.83 ANSWER 5.6, 5.68, 5.71, 5.79, 5.8 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 5. 5.71, 5.8, 5.68, 5.79, 5.6

11. ANSWER ANSWER ANSWER ANSWER 34.02 1.50 22.67 125.70 GUIDED PRACTICE for Examples 2 and 3 Round the number to the nearest hundredth. 6. 34.0152 7. 1.5034 8.22.6654 9. 125.7049

12. 1. In the division equation 42 6 = 7, 42 is called the ? , 6 is called the ? , and 7 is called the ? . ANSWER dividend, divisor, quotient round ANSWER VOCABULARY CHECK Copy and complete using a review word from the list below. digit number line less than greater than round dividend divisor quotient estimate 2. If you ? 1723 to the nearest hundred, you get 1700.

13. digit ANSWER VOCABULARY CHECK Copy and complete using a review word from the list below. digit number line less than greater than round dividend divisor quotient estimate 3. The ? in the tens’ place of the number 637 is 3.

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

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

16. 14 + 6 7 12. 15. 5 – 2 2 ANSWER 1 ANSWER 56 12 2 + 4 13. ANSWER 10 2 4 + 14. 52 ANSWER 33 SKILL CHECK Evaluate the expression.