“Spotlight on Math”5th Grade

2014-2015

Strategies for Multiplying Decimals

• Using place value mat for multiplying decimals with powers of 10.

• Using place value mat for multiplying decimals and whole numbers.

• Using place value mat for multiplying decimals and whole numbers (with regrouping)

• Using area model to multiply decimals and whole numbers.

• Explanation of tape models

• Daily Math- Math 4 Today• Fluency Sprints-worksheets & oral• Lesson of the Day- GC and incls. guided, group and independent practice• Workstations • Interactive Notebooks

A Typical Day in 5th Grade MATH Class…

Draw arrows on your place value mat to find the value of 0.04 x 10

0.04 x 10 = _____ tenthsDraw arrows on your place value mat to find the value of 0.004 x 10

0.004 x 10 = _____ hundredthsWhy does the digit move one place to the left?

Show 3 groups of 2 tenths on your place value chart. How many tenths do you have in all?

3 x 0.2

Write the solution as a number sentence.

3 x 0.3

Show 3 groups of 3 tenths on your place value chart. How many tenths do you have in all?

Write the solution as a number sentence.

4 x 0.3

Show 4 groups of 3 tenths on your place value chart. How many tenths do you have in all?

Write the solution as a number sentence.

Let’s solve using the area model.

2 x 0.43

Write 0.43 in expanded form

0.4 + 0.03

2 x 0.4 = 8 tenths

2 x 0.03 =6 hundredths2

0.8 + 0.06 = 0.86Write the products of each part here

Find the sum

4 x 0.423

Let’s solve using the area model. Write 0.423 in

expanded form

4 x 0.4 = 16 tenths

4 x 0.02 =8 hundredths

4 x 0.003 =12 thousandths

0.4 + 0.02 + 0.003

4

Write the products of each part here

1.6 + 0.08 + 0.012 = 1.692

Find the sum (this time you have to regroup)

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