Estimating 2 or 3 digit by 1 digit

A school purchased 8 boxes of chalk. Each box contained 196 pieces of chalk. Which number sentence shows the best way to use rounding to estimate the total number of pieces of chalk?

• 8 + 100 = 108

• 8 + 200 = 208

• 8 x 100 = 800

• 8 x 200 = 1,600

There are 24 hours in a day. Kendra's new puppy is 8 days old. Which is the best estimate of the number of hours Kendra's puppy has been alive? (Hint - don't round 24 - what number is it close to that is easy to count by?)

• 200

• 400

• 600

• 800

Which of these is the closest estimate for 6 x 68?

• 6 x 11 = 66

• 6 x 60 = 360

• 6 x 80 = 480

• 6 x 70 = 210

Which will cost less than $4,000?

• 6 rugs for $900 each

• 8 rugs for $600 each

• 7 rugs for $700 each

• 9 rugs for $400 each

A school purchased 6 boxes of chalk. Each box contained 189 pieces of chalk. Which number sentence shows the best way to use rounding to estimate the total number of pieces of chalk?

• 6 + 100 = 106

• 6 + 200 = 206

• 6 x 100 = 600

• 6 x 200 = 1,200

Which of these is the closest estimate for 7 x 59?

• 7 x 11 = 77

• 7 x 60 = 420

• 7 x 50 = 350

• 7 x 70 = 490

Which will cost more than $500?

• 6 lamps for $92 each

• 8 lamps for $44 each

• 5 lamps for $76 each

• 9 lamps for $51 each

Beth earns $32 per hour at her job. What is the best estimate of the amount of money she earns in 8 hours?

• $80

• $100

• $160

• $240

Which of these is the best estimate for 2 x 207?

• 2 x 60 = 120

• 2 x 200 = 400

• 2 x 700 = 1,400

• 2 x 400 = 800

Which of these is the closest estimate for 4 x 24?

• 4 x 25 = 100

• 4 x 20 = 80

• 4 x 30 = 120

• 4 x 40 = 160