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The ideas in this addition lesson are taken from Add & Subtract 2-B ebook. Rounding to nearest ten
The symbol ≈ is read "is approximately to". In the example above,
This process is called rounding to the nearest ten. Actually, 305 is equally close to 300 and 310, but it has been agreed that numbers ending in 5 are 'rounded up' or rounded to the next ten.
Practice1. Place the numbers on the number line and round them to the nearest whole ten.
2. Round these numbers to the nearest ten.
3. Estimate these sums and differences.
4. Solve the word problems using estimation. Use rounding to estimate the needed sums or differences.
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