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String Bean
Mathematics
1 September, 05:16
Estimate the product 80 * 26
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Cain
1 September, 05:27
0
You estimate it to be 80 times 30 because it is easier to do. This equals 240.
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Gracelyn Trevino
1 September, 05:28
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Looks long but it is very fast actually
26 is 25+1
Multiply by 25 is like * 100 and / 4 (because 25=100/4)
So you can see very quick that 80 * (25+1) equals 80*25+80
which is 80*100/4+80 or 80/4*100+80
So it equals 20*100+80 which you can calculate very fast to 2080
Hope you see how this is done fast
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