Reveal Math Lesson 11.4

Presentation

•

Mathematics

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4th Grade

•

Hard

Joseph Anderson

FREE Resource

5 Slides • 6 Questions

Go Math Chapter 3 Checkpoint

Chapter 3 Multiplication Methods

Old school method (regrouping)
Break it up method (partial products or distributive property)
Box method
Estimating products
Using mental math to find products

Mental math

When multiplying factors that have a zero in them, we can focus just on the first digits and then add on the zero after

34x10= 34X1 then add a zero to the product = 340

20x30= 2x3=5 then add two zeros = 500

Multiple Choice

Find the product.
70 x 40

2,800

280

Multiple Choice

Find the product.
10 x 30

300

3,000

Estimate products

When we estimate products we round each factor and then multiply them.

57x62= 60x60=120

Multiple Choice

Estimate the product.
66 x 78

4,200

4,800

5,600

Multiple Choice

What is the first step in estimating 53 x 28?

Solve the problem.

Round the numbers

Find compatible numbers

Round the numbers OR find compatible numbers

Multiplication Methods- your choice

Box method
Break it up
Old school
GET OUT PENCIL AND PAPER AND GET READY TO MULTIPLY!!!!!!

Multiple Choice

Solve.
17 x 23

931

391

139

Multiple Choice

Solve.
35 x 61

2,315

2,135

2, 531

Go Math Chapter 3 Checkpoint

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