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Estimating Sums Worksheet

Grade 6 math worksheet on estimating sums using rounding and compatible numbers.

Grade 6 Math Number SenseEstimating Sums
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Includes

2 Fill in the BlanksMultiple Choice2 Short AnswerTrue / False

Standards

CCSS.MATH.CONTENT.6.NS.B.2

Topics

mathgrade 6estimating sumsroundingnumber sense
8 sections · Free to use · Printable
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Estimating Sums

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Read each question carefully and follow the instructions to estimate the sums. Show your work where indicated.

Round each number to the nearest ten, then estimate the sum.

1. 37 + 52 ≈  

2. 81 + 19 ≈  

3. 123 + 48 ≈  

4. 256 + 73 ≈  

Round each number to the nearest hundred, then estimate the sum.

1. 145 + 289 ≈  

2. 309 + 471 ≈  

3. 562 + 138 ≈  

4. 780 + 210 ≈  

Choose the best estimate for each sum.

1. 412 + 387

a

700

b

800

c

900

d

1000

2. 67 + 23 + 48

a

120

b

130

c

140

d

150

Estimate the sum for each word problem. Show your rounding.

1. Sarah bought a book for $18 and a toy for $32. Approximately how much did she spend in total?

2. A school has 457 students in the junior section and 321 students in the senior section. About how many students are there in total?

Determine if the following statements are true or false.

1. The estimated sum of 149 and 251 (rounded to the nearest hundred) is 400.

T

True

F

False

2. When estimating 78 + 12 by rounding to the nearest ten, the estimated sum is 90.

T

True

F

False

Explain why estimating sums can be useful in everyday life.