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Anna35 [415]
3 years ago
12

Explain how using basic facts can help you find 10 X 20 X 30 X 40 mentally?

Mathematics
2 answers:
grin007 [14]3 years ago
4 0
Take the left side of each number first. Do 1 x 2 x 3 x 4. That equals 24. Easy. Now, count the 0's in the equation which are 4 of them. Add the four zeros and to the 24 and that's your answer. 240,000
laiz [17]3 years ago
4 0
First you o 10*20 which is 200. Then multiply it by 30 that equals to 6000. And then multiply it by 40 that is 240,000.
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Step-by-step explanation:

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\text{Find the price of the CD:}\\\\\text{We know that Brandon pays 8\% in sales tax}\\\\\text{We also know the cost of taxd was \$1.20}\\\\\text{Turn this into an equation, use x to represent price of CD}\\\\1.2=0.08x\\\\\text{Solve for x:}\\\\1.2=0.08x\\\\\text{Divide 1.2 by 0.08}\\\\15=x\\\\\boxed{\text{Price of CD: \$15}}

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