Ch. 3 Lessons 1-4

Which of the following equations can I solve using mental math?

• 34 x 24

• 30 x 40

• 29 x 72

• 48 x 50

Estimate the product by using rounding.

26 x 53

• 1,100

• 1,250

• 150

• 1,500

Estimate the product by using rounding.

39 x 43

• 1,600

• 160

• 16,000

• 1,800

Find the product.

45 x 60

• 300

• 2,700

• 3,000

• 270

Estimate the product by using Compatible numbers.

43 x 71

• 28,000

• 2,800

• 31,500

• 3,150

What is the first step when estimating 45 x 63?

• multiply the ones place

• multiply the ten place

• round both numbers

• Add both digits