4 years ago

Explain 81-16 in mental math

Mathematics

2 answers:

Tems11 [23]4 years ago

3 0

Answer:

we have

(81-16)

One way to use mental math is to add 4 to both 81 and 16

81+4=85\\ 16+4=20\\ 85-20=65

therefore

81-16=65

the answer is

Step-by-step explanation:

Dovator [93]4 years ago

3 0

Answer:

65 See below

Step-by-step explanation:

when doing mental math you need to break it apart to more manageable chunks.

I would think of this as 70 and 11 - 6 = 75 then subtract 10 = 65

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