Question

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Directions: Estimate the sum or difference using front-end estimation.
1) 97 – 39

2) 812,344 – 187,675

3) 321 + 79

Directions: Estimate the product using front-end estimation.

4) 315 x 821

5) 562 x 791

6) 82 x 156

7) 711 x 884

8) 126 x 952

9) 824 x 541

10) 4027 x 78

11) 796 x 123

Directions: Estimate the quotient using front-end estimation.

12) 817 19

13) 3615 72

14) 232 64

15) 559 81

16) 2986 222

17) 10275 232

18) 7428 286

19) 7143 369

20) 628,597 1525

1. thuthuy
1) 1) 97 – 39. It becomes
100 – 40 = 60
2)2) 812,344 – 187,675. It becomes
800000 – 200000 = 600000
3)321 + 79. It becomes
300 + 80 = 410
4) 315 x 821. It becomes
300 + 800 = 1100
5) 562 x 791. It becomes
600× 800 = 480000
6) 82 x 156. It becomes
80×200 = 16000
7) 711 x 884. It becomes
700×900 = 630000
8) 126 x 952. It becomes
100×1000 = 100000
9) 824 x 541. It becomes
800× 500 = 400000
10) 4027 x 78. It becomes
4000×80 = 320000
11) 796 x 123. It becomes
800×100 = 80000
12) 817 19. It becomes
800/20 = 40
13) 3615 72. It becomes
4000/70 = 57.1 = 60
14) 232 64. It becomes
200/60 = 33.3 = 30
15) 559 81. It becomes
600/80 = 7.5 = 8
16) 2986 222. It becomes
3000/200 = 15
17) 10275 232. It becomes
10000/200 = 50
18) 7428 286. It becomes
7000/300 = 23.3 = 20
19) 7143 369. It becomes
7000/400 = 17.5 = 18
20) 628,597 1525, it becomes
600000 – 2000 = 300
Step-by-step explanation: