Question

Using compatible numbers, which is the best estimate of (28.5)(7.1)?

Answer 1

Given :- Using compatible numbers, which is the best estimate of (28.5)(7.1) ?

a. 36

b. 40

c. 210

d. 300.

Solution :-

Compatible numbers :- The integers that are closest to the given numbers (in decimals), which are easy to compute.

Or, we can say that,

• Numbers that are easy to add, subtract, multiply, or divide mentally.

Examples :-

• 513 + 299 => 500 + 300 = 800 .
• 19.4 - 3.8 => 19 - 4 = 15
• 19.4 * 3.8 => 20 * 4 = 80 .
• 721 ÷ 70 => 700 ÷ 70 = 10 .

So,

→ 28.5 * 7.1

→ 30 * 7

→ 210 (Ans.) (Option C).

Learn more :-

instead of calculating the sum of a proper fraction 1/2 with its reciprocal, the difference was worked out : as a reult ...

https://brainly.in/question/26687959