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

Prerequisite Skills SKILL CHECK PLACE VALUE Name: ______________Date: _______________ ____ hr MathMC2 Ch 2 pgs 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

Prerequisite Skills SKILL CHECK PLACE VALUE Name: ______________Date: _______________ ____ hr MathMC2 Ch 2 pgs 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

Prerequisite Skills SKILL CHECK Round the number to the place value of the red digit ANSWER , ANSWER ANSWER ANSWER

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

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

Prerequisite Skills GUIDED PRACTICE for Example 1 Copy and complete the statement using, or = ? 30.4 ANSWER < ? 7.70 ANSWER = ? ANSWER >

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 ANSWER

Prerequisite Skills SOLUTION EXAMPLE 3 Rounding a Decimal Round to the nearest tenth ANSWER The decimal 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.

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

Prerequisite Skills GUIDED PRACTICE Round the number to the nearest hundredth ANSWER ANSWER ANSWER ANSWER for Examples 2 and 3

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 digitnumber lineless thangreater than rounddividenddivisorquotient estimate

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

Prerequisite Skills Estimate the sum or difference. ANSWER , , ,036 ANSWER 100, SKILL CHECK

Prerequisite Skills Estimate the sum or difference – 1951 ANSWER ,780 – 17,702 ANSWER 9000 SKILL CHECK

Prerequisite Skills ANSWER 56 ANSWER Evaluate the expression. ANSWER – 2 2 ANSWER 1 SKILL CHECK