Module 2 Lesson 2Estimate multi-digit products by rounding

factors to a basic fact and using place value patterns.

• 5.NBT.1  Recognize that in a multi-digit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represents in the place to its left.

5.NBT.2  Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents to denote power of 10.

Common CoreStandards

Learning Targets

•I can Estimate multi-digit products by rounding factors to a basic fact and using place value patterns.

Sprint A

Sprint B

Activate Knowledge

Write the multiplication sentence

31 × 10 =

Activate Knowledge

Write the multiplication sentence

31 × 10 =

310 × 2 =

Activate Knowledge

Write the multiplication sentence

31 × 10 =

310 × 2 =

310 × 20 =

Activate Knowledge

Write the multiplication sentence

23 × 10 =

Activate Knowledge

Write the multiplication sentence

23 × 10 =

230 × 4 =

Activate Knowledge

Write the multiplication sentence

23 × 10 =

230 × 4 =

230 × 40 =

Activate Knowledge

Write the multiplication sentence

32 × 10 =

Activate Knowledge

Write the multiplication sentence

32 × 10 =

320 × 3 =

Activate Knowledge

Write the multiplication sentence

32 × 10 =

320 × 3 =

320 × 30 =

Activate Knowledge

Jonas practices guitar 1 hour a day for 2 years. Bradley practices the guitar 2 hours a day more than Jonas. How many more minutes does Bradley practice the guitar than Jonas over the course of 2 years?

Learn

Estimate

23 x 18

Problem 1

Learn

Estimate

23 x 18

2 x 2 x 10 x 10

20 x 20

Problem 1

Learn

Estimate

456 × 42

Problem 2

Learn

Estimate

456 × 42

460 x 40

Problem 2

Learn

Estimate

456 × 42

500 x 40

Problem 2

Learn

Estimate

456 × 42

5 x 4 x 10 x 10 x 10

500 x 40

Problem 2

Learn

Estimate

4560 × 42

Problem 3

Learn

Estimate

4560 × 420

Problem 4

Learn

Estimate

1,320 x 88

Problem 5

Estimate

13,205 × 880

1,320 × 88 ≈ 90,000

Problem 6

✔Check Understanding

Estimate

3,120 × 880

Problem 7

✔Check Understanding

Practice

Review