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Earn +20 ptsQ: How do yo round to estimate sums and differences in math?
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Estimating sums and differences?
xxx=2x
The thing combines multiplication with sums and differences?
distributive property
How do you estimate sums and differences?
Once can roughly round to tens if the numbers are less than 1000, or to hundreds if the numbers are less than 10000, etc., trying to make up for large round-off errors which occur when the number are close to 1/2 the round-off amount. E.G Add: 13+ 57+ 49 + 45 + 78 + 105 Add 10 + 60 +50 + 50 + 80 + 100
What is to different pairs of decimals whose sums are 14.1 one pair should involve regrouping on math?
The two different pairs of decimals whose sums are 14.1 and one pair involves regrouping on math are 8.4 and 5.7.
Explain how to use the associative properties of addition and multiplication to find sums mentally?
use mental math
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