Quick Check Lesson 4.2

Which is the BEST estimate for the product of 19.3 x 6?

• 20 x 6 = 120

• 19 x 10 = 190

• 20 x 10 = 200

• 19 x 6 = 114

Which is the BEST estimate for the product of 3 x 0.85?

• 3 x 0 = 0

• 3 x 0.85 = 2.55

• 3 x 1 = 1

• 5 x 1 = 5

What is the BEST estimate for the product of 1.56 x 48?

• 1 x 48 = 48

• 2 x 50 = 100

• 1.5 x 40 = 60

• 1 x 50 = 50

Rounding to the nearest tenth, which of the following give an overestimate? (There may be more than one.)

• 37.63 x 0.54

• 54.49 x 0.45

• 1.19 x 1.45

• 0.31 x 8.01

• 27.83 x 13.64

Rounding to the ones place, which of the following give an underestimate? (There may be more than one.)

• 2.7 x 13.5

• 4.51 x 8.7

• 9.19 x 8.48

• 7.49 x 11.4

• 3.6 x 6.5