Reveal Math Lesson 11.4

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
• 28

Multiple Choice

Find the product.
10 x 30

• 300
• 30
• 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