Estimating sums

Mr. Avery’s class made $118 for the fundraiser. Mrs. Bolero’s class made $189 for the fundraiser. Which of these statements shows the best estimate of the total amount both classes raised?

• $100 + $200 = $300

• $125 + $150 = $275

• $100 + $100 = $200

• $200 + $200 = $400

Write a sum that could be rounded to 240 + 360 when rounded to the nearest 10.

The science club raised $345 and the math club raised $275. Which estimate is closest to the total amount raised by both clubs?

• $300 + $300 = $600

• $350 + $250 = $600

• $300 + $200 = $500

• $400 + $300 = $700

During a charity event, Group A raised $123 and Group B raised $198. What is the most accurate estimate of the total funds raised? (rounding to the nearest 10)

• $100 + $200 = $300

• $120 + $200 = $350

• $120 + $190 = $310

• $100 + $100 = $200

• 500 - 200 = 300
• 600 - 200 = 300
• 600 - 200 = 400
• 500 - 200 = 200

• 400 + 200 = 600
• 500 + 200 = 600
• 500 + 200 = 700
• 400 + 200 = 700

• 900 - 300 = 600
• 900 - 200 = 700
• 1,000 - 200 = 800
• 900 + 300 = 1,200

Round to the nearest hundred, then estimate the sum:

123 + 456

• 580

• 600

• 650

• 500

Which of the following COULD be used to estimate the sum 5,759 + 2,958? (mark all that apply)

• 6,000 + 3,000 = 9,000

• 5,800 + 3,000 = 8,800

• 5,760 + 2,960 = 8,720

• 5,000 + 3,000 = 8,000

Estimate the following sum.

• 50

  • + 40

  90

• 60

  • + 30

  90

• 60

  • + 40

  100