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Estimating Sums and Differences - in Decimals
Last updated at July 25, 2026 by Teachoo
Class 7 (Ganita Prakash 1, 2 & old NCERT)
Chapter 3 Class 7 - A peek beyond the Point (Ganita Prakash)
- Fractions - Quick Revision
- Need for a smaller unit
- Tenth
- Hundredth
- Figure it out - Page 58
- Decimals
- Fractions to Decimals
- Reading and Writing Decimals
- Unit Conversion - Weight, Length, Money
- Decimal in number line
- Finding greater decimal
- Closest decimal
- Addition and Subtraction of Decimals
- Decimal Sequences
-
Estimating Sums and Differences
- More on Decimal System
- Figure it out - Page 78, 79, 80
- Teachoo Questions - MCQs
- Teachoo Questions - Mix
- Teachoo Questions - Assertion Reasoning
- Teachoo Questions - Case Based
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Transcript
Estimating Sums and Differences - in Decimals Estimating means to change a number to another number that is close to it. Estimating is used to make calculations easier and it gives us an answer that is close to the actual answer. 2.8 can be estimated to be close to 3 . 5.1 can be estimated to be close to 5 . The sum of 2.8 + 5.1 can be estimated to be 3 + 5 = 8 2.8 + 5.1 = 7.9 which is the exact answer. This is very close to 3 + 5 = 8, our estimated answer. And, how to estimate a decimal?
