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### Grade 3 - Mathematics5.4 Estimating Sums and Differences

 Method: Round the numbers to the places mentioned. 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: 419 - 187 estimate is about ________ . (hint: estimate the difference of three digit numbers by rounding to nearest hundreds place, that is 400-200 = ?).300400200 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 = ?).406050 Q 3: 29 + 45 estimate is about ________ . (hint: estimate the sum of two digit numbers by rounding to nearest tens place, that is 30+50 = ?).507080 Q 4: 928 - 237 estimate is about ________ . (hint: estimate the difference of three digit numbers by rounding to nearest hundreds place, that is 900-200 = ?).700800600 Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!

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