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.

   Bo walks 9.6 km on Saturday and 2.7 km on Sunday. Rounding each to the nearest whole, about how much is that in all?

   13

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

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

   • 6.5
   • 6
   • 7
6. 5.

   Using the columns, what does 9.91 round to for Luz?

   • 10
   • 9
   • 9.9
7. 6.

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

   • 1/2
   • 0
   • 1
8. 7.

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

   • 1
   • 1/2
   • 0
9. 8.

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

   • 1
   • 1/2
   • 0
10. 9.

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

    • Yes: the digits look right
    • Yes: sums can be small
    • No: it should be about 12
11. 10.

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

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