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Mathematics

1 answer:

motikmotik3 years ago

3 0

Answer:

Step-by-step explanation:

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Give one example of when would use the friendly numbers strategy to substract. Explain why

Andrei [34K]

Here is one example of when you would use the friendly number strategy to subtract.
42 - 18

We will turn the 18 into a friendly number, which is going to be 20.

(42 + 2) - (18 + 3)
44 - 20
Now it is easier to subtract 44 - 20 than it is 42 -18. With 42 - 18 we would have to barrow whereas with 44 -20 we do not have to barrow and we can do it in our head easier and makes it faster.

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3 years ago

The distance from a star to a planet is approximately 90,000,000 miles. If light travels at a rate of 186,000 miles per second,

algol13

So to get this the easiest way would be to:
-put 90,000,000 over 186,000 and cancel out zeroes so you have 90,000 divided by 186 ( so it makes more sense in long division later)
-Then divide 90,000 by 186
-get 483.87 seconds
Hope this helped!

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3 years ago

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Your parents are building a pool that is 7 ft wide and 12 ft long. They want to put a walkway around the pool that is x ft wide

Luden [163]

Answer:

25 /12*6 =12.5

Step-by-step explanation:

thats what i got

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3 years ago

Nadusha1986 [10]