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2 years ago

18 x 5 Use mental math to solve. Find as many strategies as you can to solve. Record and describe each strategy.

Mathematics

1 answer:

Sophie [7]2 years ago

3 0

Answer:

Here are a few ways that I do that:

18 * 5 is the same as (10 + 8) * 5, which equals 50 + 40, which is 90

It's also the same as (20 - 2) * 5, which equals 100 - 10, again, 90

It's also 9 * 2 * 5, which equals 9 * 10, or 90

It's also 3 * 6 * 5, or 3 * 30, which is 90.

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malfutka [58]

Using proportions, it is found that she will pay $8.28 in total after the discount.

<h3>What is a proportion?</h3>

A proportion is a fraction of a total amount, and the measures are related using a rule of three.

Before tax, the total price is given by:

P = 3.59 + 4.25 + 3.99 = $11.83.

She gets a 30% discount, hence the proportion she pays is 70% of this amount, hence:

P = 0.7 x 11.83 = $8.28.

She will pay $8.28 in total after the discount.

More can be learned about proportions at brainly.com/question/24372153

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1 year ago

Please help with the questions. Thank you.

IrinaVladis [17]

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https://www.mathsisfun.com/algebra/inequality-solving.html

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Step-by-step explanation:

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3 years ago

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