Estimating Using Compatible Numbers

Which of the following will give the closest estimate of:

77 - 28

• 75 - 30

• 80 - 30

• 80 - 25

• 70 - 30

Which of the following will give the closest estimate of:

109 - 75

• 110 - 80

• 105 - 75

• 110 - 75

• 110 - 70

Which of the following will give the closest estimate of:

153 - 97

• 150 - 100

• 155 - 95

• 160 - 95

• 155 - 100

Which of the following will give the closest estimate of:

266 - 157

• 265 - 160

• 265 - 155

• 270 - 155

• 265 - 150

Which of the following will give the closest estimate of:

304 - 244

• 300 - 245

• 305 - 245

• 305 - 240

• 305 - 250

Which of the following will give the closest estimate of:

357 - 248

• 360 - 250

• 355 - 250

• 360 - 245

• 350 - 245

Which of the following will give the closest estimate of:

414 - 264

• 415 - 265

• 410 - 265

• 415 - 260

• 400 - 270

Which of the following will give the closest estimate of:

611 - 396

• 610 - 400

• 615 - 395

• 610 - 395

• 600 - 390

Which of the following will give the closest estimate of:

746 - 451

• 750 - 450

• 700 - 500

• 750 - 460

• 745 - 450

Which of the following will give the closest estimate of:

889 - 519

• 900 - 500

• 890 - 510

• 890 - 520

• 900 - 520