21 is 60 percent of what number

You have actually learned that to find 1% of a number way finding 1/100 that it. Similarly, finding 60% that a number method finding 60/100 (or 6/10) of it.In this expressions, words “of” translates into multiplication:1% the 90 → 1% × 90&

We can additionally write those percentages as decimals:1% of 90 → 0.01 × 90

60% that $700 → 0.6 × $700.

This gives us another way to calculation the portion of a number (or percentage of part quantity):

Following the shortcut, we compose this as 0.7 × 80.

Remember that in decimal multiplication, you multiply together if there were no decimal points, and also the price will have as plenty of “decimal digits” to the right of the decimal suggest as the total number of decimal digits of all of the factors. So when you multiply 0.7 × 80, think of multiply 7 × 80 = 560. Since 0.7 has actually one decimal digit, and 80 has actually none, the answer has one decimal digit: 56.0 Thus, 0.7 × 80 = 56.

You can also use “common sense” to reason it with logically: 0.7 × 80 should be less than 80, yet more than 1/2 of 80, i beg your pardon is 40. Due to the fact that 7 × 8 = 56, you understand that the answer need to be 56—not 5.6 or 560.

First create it together 0.03 × $4,000. Climate multiply 3 × $4,000 = $12,000. Ultimately put the decimal suggest where it gives the answer 2 decimal digits: $120.00.

Write the expression as 0.23×5,500km and use a calculator to calculation the product. The answer is 1,265km. This answer renders sense since 10% of 5,500km is 550km, for this reason 20% is 1,100km. Hence 1,265km together 23% the 5,500km is a reasonable answer.