Estimate first: is this answer sensible?

Answer Key - Grade 6 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Ari pours 4.8 liters and 7.3 liters of lemonade into one big jug (for a very thirsty team). Rounding each to the nearest whole, about how much is that in all?

   12
2. 2.

   Esme's sunflower is 12.4 cm tall and grows 5.9 cm more. Rounding each to the nearest whole, about how much is that in all?

   18

3. Read this first

   Use this

   Place-value columns for rounding to the nearest whole (look at the tenths: 5 or more rounds up). Columns: number, ones digit, tenths digit, rounds to. 3.48, 3, 4, 3; 6.52, 6, 5, 7; 9.91, 9, 9, 10.

4. 3.

   Using the columns, why does Jun round 3.48 to 3?

   • Its hundredths digit, 8, is big
   • Its tenths digit, 4, is under 5
   • Its ones digit, 3, is odd
5. 4.

   Using the columns, what does 6.52 round to for Kira?

   • 6
   • 6.5
   • 7
6. 5.

   Milo has 7/8 of a pizza left. Which friendly number is it close to?

   • 1
   • 1/2
   • 0
7. 6.

   Noah has read 5/12 of a book. Which friendly number is it close to?

   • 1/2
   • 1
   • 0
8. 7.

   Pia has painted 1/9 of a fence. Which friendly number is it close to?

   • 1
   • 1/2
   • 0
9. 8.

   Ren adds 4.8 + 7.3 and gets 1.21. Is that sensible?

   • Yes: sums can be small
   • No: it should be about 12
   • Yes: the digits look right
10. 9.

    Tala works out 19.6 − 9.8 = 9.8. Is that sensible?

    • No: it should be about 2
    • No: it should be about 29
    • Yes: it is about 10
11. 10.

    Zee buys 2 sketchbooks at $2.95 each and thinks the total is $59.70. Is that sensible?

    • No: it should be about $6
    • No: it should be about $1.50
    • Yes: it should be about $60