Estimate the products on the left and match them to the numbers given on the right. 25 × 31, 132 × 19, 101 × 11, 248 × 49, 12 × 25. Match with: 2,600, 12,500, 300, 750, 1,000. Discuss how you estimated.

25 × 31 ≈ 25 × 30 = 750 (matches 750). 132 × 19 ≈ 130 × 20 = 2,600 (matches 2,600). 101 × 11 ≈ 100 × 10 = 1,000 (matches 1,000). 248 × 49 ≈ 250 × 50 = 12,500 (matches 12,500). 12 × 25 = 300 (matches 300). — Estimation involves rounding numbers to convenient values and multiplying. For example, 25 × 31 is close to 25 × 30 = 750. 132 × 19 is close to 130 × 20 = 2,600.

Estimate the products on the left and match them to the numbers…

Question 38 of 47intermediate🔧 ApplyMatching3 marks

Estimate the products on the left and match them to the numbers given on the right. $25 \times 31$ , $132 \times 19$ , $101 \times 11$ , $248 \times 49$ , $12 \times 25$ . Match with: 2,600, 12,500, 300, 750, 1,000. Discuss how you estimated.

Correct Answer

$25 \times 31$ $\approx$ $25 \times 30$ = 750 (matches 750). $132 \times 19$ $\approx$ $130 \times 20$ = 2,600 (matches 2,600). $101 \times 11$ $\approx$ $100 \times 10$ = 1,000 (matches 1,000). $248 \times 49$ $\approx$ $250 \times 50$ = 12,500 (matches 12,500). $12 \times 25$ = 300 (matches 300).

Exercise: Let Us Think (Section 2) | Q: 2 | (Page Page 19)

For More Understanding

Explanation

Estimation involves rounding numbers to convenient values and multiplying. For example, $25 \times 31$ is close to $25 \times 30$ = 750. $132 \times 19$ is close to $130 \times 20$ = 2,600.

Solution Steps

Step 1: Round each number to a convenient value
Step 2: Multiply the rounded numbers
Step 3: Match with the closest estimate

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