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Crazy boy [7]
3 years ago
10

How can you express 499 to find the product 499 x 5 using mental math? explain

Mathematics
1 answer:
Mashcka [7]3 years ago
4 0
We can write 499 as 499 = 500 - 1

Because it is easy to multiply 500 and 5 compare to 499 to 5.

So product of 499 * 5 = (500 - 1)*5
                                   = 500*5 - 1*5
                                   = 2500 -5 = 2495

So the answer is 2495.
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Step-by-step explanation:

This is because proportional is something that adds up with each other.

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2 years ago
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max2010maxim [7]

Answer:

C, 3 1/2, 3 19/20, 3 39/40

Step-by-step explanation:

to make this a bit easier, we can put the mixed numbers into improper fractions:

3 39/40 becomes 159/40

3 19/20 becomes 79/20

3 1/2 becomes 7/2

comparing them to each other, we see they have unlike denominators. we need to get the denominators alike so we can compare them easier

the fractions all have a common denominator of 40, so we need to multiply each fraction by a number that gives us a denominator of 40

159/40 is already fine

79/20 needs to be multiplied by 2 to get a denominator of 40

79/20 x 2 = 158/40

7/2 needs to be multiplied by 20 to get a denominator of 40

7/2 x 20 = 140/40

from least to greatest, we have the following:

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3 1/2, 3 19/20, 3 39/40

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3 years ago
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sattari [20]
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Use long division to convert -45/8 to a decimal.
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Answer:

16+2=18

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Step-by-step explanation:

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