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Grade 3 - Mathematics
5.4 Estimating Sums and Differences

Method:
  1. Round the numbers to the places mentioned.
  2. Add or subtract after estimation as per the question.
Example: 38 + 49 estimate is about _______.
Rounding both the numbers to the nearest tens place.
40 + 50
Answer: 90

Example: 458 - 159
Rounding both the numbers to nearest hundreds
500 - 200
Answer: 300


Directions: Find sums or differences after estimation. Also write at least ten examples of your own.
Q 1: 29 + 45 estimate is about ________ . (hint: estimate the sum of two digit numbers by rounding to nearest tens place, that is 30+50 = ?).
70
50
80

Q 2: 87 - 41 estimate is about ________ . (hint: estimate the difference of two digit numbers by rounding to nearest tens place, that is 90-40 = ?).
40
60
50

Q 3: 559 + 318 estimate is about ________ . (hint: estimate the sum of three digit numbers by rounding to nearest hundreds place, that is 600+300 = ?).
800
500
900

Q 4: 419 - 187 estimate is about ________ . (hint: estimate the difference of three digit numbers by rounding to nearest hundreds place, that is 400-200 = ?).
300
200
400

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