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Inessa [10]
3 years ago
7

Write an expression that can be used to multiply 6 times 198 mentally

Mathematics
1 answer:
Zigmanuir [339]3 years ago
5 0
I would half 198, get
99 and add a 0, this is how you multiply by 5 in your head

198*5 = 990
990 + 200 = 1190 - 2
= 1188

Alternatively we can round 198 to 200: then multiply by 6

200*6 = 1200

Then We subtract the 6 "2's" that we added

1200 - 12 = 1188


The expression for this is:
(6*200) - (6 * 2)
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