Divisible by 3?

1 answer:

4 0

The third one is divisible by 3; and you can figure that out quickly by adding up the individual numbers in each number and seeing if it is divisible by 3.
Example: 8+5+0+1+9+4+5+7 = 39 39/3 = 13
3+2+8+3+2+9+8+8 = 43 43/3 = 14 1/3

Only works like that when dividing by 3 though

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2 1/2 divided by 1 5/8? I forgot how to divide fractions and simplify them....please help

nlexa [21]

$2\frac{1}{2}:1\frac{5}{8}=\frac{2\times2+1}{2}:\frac{1\times8+5}{8}=\frac{5}{2}:\frac{13}{8}=\frac{5}{\not2_1}\times\frac{\not8^4}{13}=\frac{5}{1}\times\frac{4}{13}=\frac{5\times4}{1\times13}=\frac{20}{13}=1\frac{7}{13}$

3 0

3 years ago

Read 2 more answers

Need help on this! Please someone help!!!

Jet001 [13]

This can be easily solved, especially with a calculator.
With the calculator, you can find that $\sqrt{42}$ is about 6.4807.
Multiply that by 2, you get about 13 inches.

If you can't use a calculator, then you can just estimate. Since we know that $\sqrt{36}$ is 6 and $\sqrt{49}$ is 7, $\sqrt{42}$ is in between them, so you can just say somewhere around 6.5.

Multiply 2 * 6.5 and you get 13 inches.