Module 2 Lesson 12
Multiply decimal fractions by multi-digit whole
numbers through conversion to a whole number
problem and reasoning about the placement of the
decimal.
Common Core
Standards
5.OA.2 Write simple expressions that record calculations with
numbers, and interpret numerical expressions without evaluating
them. For example, express the calculation “add 8 and 7, then
multiply by 2” as 2 × (8 + 7). Recognize that 3 × (18932 + 921) is
three times as large as 18932 + 921, without having to calculate
the indicated sum or product.
5.NBT.5 Fluently multiply multi-digit whole numbers using the
standard algorithm.
Learning Targets
• I can multiply decimal fractions by multidigit whole numbers through conversion
to a whole number problem and
reasoning about the placement of the
decimal.
Activate
Knowledge
12 in = ___ ft.
Activate
Knowledge
24 in = ___ ft.
Activate
Knowledge
36 in = ___ ft.
Activate
Knowledge
48 in = ___ ft.
Activate
Knowledge
120 in = ___ ft.
Activate
Knowledge
1 ft = ___ in.
Activate
Knowledge
2 ft = ___ in.
Activate
Knowledge
2.5 ft = ___ in.
Activate
Knowledge
3 ft = ___ in.
Activate
Knowledge
3.5 ft = ___ in.
Activate
Knowledge
4 ft = ___ in.
Activate
Knowledge
4.5 ft = ___ in.
Activate
Knowledge
9 ft = ___ in.
Activate
Knowledge
9.5 ft = ___ in.
Activate
Knowledge
27 ft = ___ in.
Activate
Knowledge
27.5 ft = ___ in.
Activate
Knowledge
Say the number as a decimal
8 tenths
Zero point eight
Activate
Knowledge
Say the number as a decimal
35 tenths
Activate
Knowledge
Say the number as a decimal
45 tenths
Activate
Knowledge
Say the number as a decimal
85 tenths
Activate
Knowledge
Say the number as a decimal
83 tenths
Activate
Knowledge
Say the number as a decimal
63 tenths
Activate
Knowledge
Say the number as a decimal
47 tenths
Activate
Knowledge
Say the number as a decimal
8 hundredths
Activate
Knowledge
Say the number as a decimal
10 hundredths
Activate
Knowledge
Say the number as a decimal
20 hundredths
Activate
Knowledge
Say the number as a decimal
30 hundredths
Activate
Knowledge
Say the number as a decimal
90 hundredths
Activate
Knowledge
Say the number as a decimal
95 hundredths
Activate
Knowledge
Say the number as a decimal
99 hundredths
Activate
Knowledge
Say the number as a decimal
199 hundredths
Activate
Knowledge
Say the number as a decimal
299 hundredths
Activate
Knowledge
Say the number as a decimal
257 hundredths
Activate
Knowledge
Say the number as a decimal
463 hundredths
Activate
Knowledge
Thirty-two cyclists make a seven day trip. Each
cyclist requires 8.33 kg of food for the entire trip. If
each cyclist wants to eat an equal amount of food
each day, how many kg of food will the group be
carrying at the end of day 5?
Learn
Estimate the product
2.31 x 22
Problem 1
Learn
2.31 x 22
Predict whether our estimate is
greater than or less than the
actual product.
Problem 1
Learn
Use an area model to find the
product
2.31 x 22
Problem 1
Learn
Solve using the algorithm
2.31 x 22
Problem 1
Learn
Estimate the product
2.31 x 221
Problem 2
Learn
2.31 x 221
Predict whether our estimate is
greater than or less than the
actual product.
Problem 2
Learn
Use an area model to find the
product
2.31 x 221
Problem 2
Learn
Solve using the algorithm
2.31 x 221
Problem 2
Learn
Estimate the product
2.31 x 201
Problem 3
Learn
2.31 x 201
Predict whether our estimate is
greater than or less than the
actual product.
Problem 3
Learn
Solve using the algorithm
2.31 x 201
Problem 3
Learn
Estimate the product
4.95 x 11
Problem 4
Learn
4.95 x 11
Predict whether our estimate is
greater than or less than the
actual product.
Problem 4
Learn
Solve using the algorithm
4.95 x 11
Problem 4
Learn
Estimate the product
0.98 × 495
Problem 5
Learn
0.98 × 495
Predict whether our estimate is
greater than or less than the
actual product.
Problem 5
Learn
Solve using the algorithm
0.98 × 495
Problem 5
Learn
Estimate the product
102.64 × 495
Problem 6
Learn
102.64 × 495
Predict whether our estimate is
greater than or less than the
actual product.
Problem 6
Learn
Solve using the algorithm
102.64 × 495
Problem 6
Practice
Review