3 years ago

Please help, I keep getting bots. Using front-end estimation, find a reasonable estimate of:

Mathematics

2 answers:

Aleks [24]3 years ago

5 0

Answer:

Roughly 18,000

Step-by-step explanation:

When you need to do rough mental math, you can do something like 720 vs 25 or 30 which is pretty simple to do in your head.

If you are very proficient in mental math, you can do something like 720 * 25, which is harder, but if you know the tricks, you can do this quickly.

720 * 25

Multiply 25 by 7.

175

Add two zeros.

17,500

Multiply 25 by 2

Add a zero.

500.

17500 + 500 = 18000

cestrela7 [59]3 years ago

4 0

Answer: 18,694

Step-by-step explanation:

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8090 [49]

Aby ended up at the school. Nice hands btw xD

8 0

4 years ago

5. Two-fifths of a number is -26. Find the number.

klio [65]

Answer:

x = -65

Step-by-step explanation:

To start off, we can create our equation. We know that "of" is just another word for multiply. We will then end up with $\frac{2}{5}$ * x = -26. To solve this equation, we will find $\frac{2}{5}$ of -26. To make things less confusing, lets take away the negative for now. 26 x 5 = 130 and 130 ÷ 2 is 65. We then add our negative back on and x = -65.