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Liono4ka [1.6K]
3 years ago
13

Explain how to make these couculations mentaly a. 99+54 b.244-99

Mathematics
1 answer:
IrinaVladis [17]3 years ago
5 0

<h2><u>PLEASE MARK BRAINLIEST!</u></h2>

<u></u>

Answer:

Use estimation

Step-by-step explanation:

A) 99 + 54

estimate that 99 is 100

estimate that 54 is 55

Add 100 and 55 together

100 + 55 = 155

Remember that you added 1 to 99 and 1 to 55

So you must subtract 2 from 155

155 - 2 = 153

Your answer is 153.

B) 244 - 99

estimate that 244 is 245

estimate that 99 is 100

Add 245 and 100 together

245 + 100 = 345

Remember that you added 1 to 245 and 1 to 99

So you must subtract 2 from 345

345 - 2 = 343

Your answer is 343.

<em>Remember that you are doing all of this in your head!</em>

<em />

I hope this helps!

- sincerelynini

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