Mon Prof Augmenté
Rounding to the Nearest Ten
Age 9 · Maths
Round each number to the nearest ten. Then add the rounded numbers to estimate the sum.
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Age 9: open this week
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Examples
- 38 marbles plus 21 marbles, think 40 + 20 = 60 marbles.
- 47 stickers plus 32 stickers, think 50 + 30 = 80 stickers.
Key takeaways
- A number ending in 1, 2, 3, or 4 rounds down to the ten below.
- A number ending in 5, 6, 7, 8, or 9 rounds up to the ten above.
Quiz: Rounding to the Nearest Ten (Age 9)
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To estimate a sum by rounding to the nearest ten, what should you do?
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A number ends in 4. How should it be rounded to the nearest ten?
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A number ends in 6. How should it be rounded to the nearest ten?
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