Write an expression that can be used to multiply 6x198 mentally.

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27-01-2015
Mathematics

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Write an expression that can be used to multiply 6x198 mentally.

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ryanholly61 ryanholly61 · Answer 1 · 2016-09-19T16:58:02-04:00

ryanholly61 ryanholly61

19-09-2016

assuming you meant 6x198 do a mental sum for 6x200 (1200) then subtract 6x2(12)to give you 1188

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meerkat18 meerkat18 · Answer 2 · 2016-09-20T05:55:01-04:00

meerkat18 meerkat18

20-09-2016

In this problem, we are asked to give an expression that can be used to mentally multiply 6 and 198. In order not to go through the rigorous multiplication, we can estimate 198 to 200, that is 6 *200 equal to 1200. Since there is a 2*6 excess or 12 then we subtract: 1200 -12 equal to 1188.

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