Math 3 · Unit 1: Numbers to 1000 · Cambridge Primary Maths Stage 3

Questions

1. 1. Estimate how many stars there are in the box.

   • about 1000
   • about 300
   • about 30
   • about 3000
   Check

2. 2. Estimate how many grains of rice are on the middle spoon.

   • 200 to 400
   • 600 to 800
   • 400 to 600
   • 100 to 200
   Check

3. 3. Round each number to the nearest 10. Which list is right for 271, 138, 397 and 404?

   • 280, 140, 400, 410
   • 300, 100, 400, 400
   • 270, 130, 390, 400
   • 270, 140, 400, 400
   Check

4. 4. Round each number to the nearest 100. Which list is right for 164, 325, 449 and 250?

   • 100, 300, 400, 200
   • 200, 300, 450, 250
   • 200, 400, 500, 300
   • 200, 300, 400, 300
   Check

5. 5. Class 3 used this table to check their estimates of the number of beans in plastic bags. Samira estimated that her bag had 300 to 400 beans. They weighed 18 grams. Is this a good estimate?

   • Yes
   • No
   Check

6. 6. Pedro's beans weighed 31 grams. What range would be a good estimate for his beans?

   • 300 to 400 beans
   • 500 to 600 beans
   • 700 to 800 beans
   • 600 to 700 beans
   Check

7. 7. Round each amount to the nearest $10. Which list is right for $537, $772, $695 and $808?

   • $540, $780, $700, $810
   • $540, $770, $700, $800
   • $530, $770, $690, $800
   • $540, $770, $700, $810
   Check

8. 8. Round each amount to the nearest 100 kilograms. Which list is right for 150, 555, 444 and 501 kilograms?

   • 100, 500, 400, 500 kilograms
   • 200, 600, 400, 600 kilograms
   • 200, 500, 500, 500 kilograms
   • 200, 600, 400, 500 kilograms
   Check

9. 9. Round the height of each tower to the nearest 10 metres and then to the nearest 100 metres. Which is right for the Lotte World Tower?

   • 550 m and 500 m
   • 560 m and 600 m
   • 560 m and 500 m
   • 550 m and 600 m
   Check

10. 10. Which towers are the same height when their heights are rounded to the nearest 100 metres?

    • Willis Tower and Burj Khalifa
    • Lakhta Centre and Petronas Tower 1
    • Lakhta Centre and Shanghai Tower
    • Willis Tower and Petronas Tower 1
    Check

11. 11. Zara rounds a number to the nearest 10 and the nearest 100. Both times she gets 500. Which number could it be?

    • 505
    • 498
    • 489
    • 520
    Check

12. 12. Round each number in the grid to the nearest 100. Drag a number into each empty square.

    Fill the blanks with these.

    • 400
    • 300
    • 600
    • 1000
    • 500
    • 800
    • 700
    • 100
    • 200
    Check

13. 13. In a shop, all prices are rounded to the nearest $10. Would all the customers be happy about the changes in price?

    • Yes
    • No
    Check