Question

Estimate by rounding off to the nearest :
(1) tens (2) hundreds (3) thousands
(i)2894+3412+5656
(ii) 7012-3418​

Answer 1

Answer:

Step-by-step explanation:

1) (i) 2890 + 3410 + 5660

= 11,960

2) (i) 2900 + 3400 + 5600

= 11,900

3) (i) 3000 + 3000 + 6000

= 12000

1) (ii) 7010 - 3420

= 3590

2) (ii) 7000 - 3400

= 3600

3) (ii) 7000 - 3000

= 4000

Answer 2

The correct answers are given below:

• To round off to the nearest tens hundreds or thousands, we need to check the digit to its immediate right.

        a) If the digit to its immediate right is < 5, replace that digit and the

         following digits with 0. In this case, the number is rounded down.

        b) If the digit to its immediate right is ≥ 5, replace that digit with 1

            and the following digits by 0. In this case, the number is rounded

            up.

• (1) Rounding off to the nearest tens using the above rules, we get:

        (i) 2894+3412+5656 = 2890 + 3410 + 5660 = 11,960

        (ii) 7012-3418 = 7010 - 3420 = 3590

• (2) Rounding off to the nearest hundreds using the above rules, we get:

        (i) 2894+3412+5656 = 2900 + 3400 + 5600 = 11,900

        (ii) 7012-3418​ = 7000 - 3400 = 3600

• (3) Rounding off to the nearest thousands using the above rules, we get:

        (i) 2894+3412+5656 = 3000 + 3000 + 6000 = 12000

        (ii) 7012-3418​ = 7000 - 3000 = 4000

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