WJEC Past Paper Questions (with Answers). Estimation WJEC Past Paper Questions (with Answers).

8·6 = 8610 so 8·6  73 = 8610 73= (8673) 10 =6278 10 =627·8 860 = 86  10 and 7·3 = 73 10 so 860  7·3 = 86  10  73  10 = 86  73  10  10 = (86  73) = 6278 6278  73 = 86

Using Estimation 8 x 70 = 560 so the answer must be about 560 so 8·6 x 73 = 627·8 900 x 7 = 6300 so the answer must be around 6300, so 860 x 7·3 = 6278 6278  73 = 86

4·5 = 45  10 and 6·7 = 67  10 so 4·5 x 6·7 = 45  10 x 67  10 = 45 x 67  10  10 = (45 x 67)  100 = 3015  100 = 30·15 450 = 45 x 10 and 0·67 = 67  100 so 4·5 x 6·7 = 45 x 10 x 67  100 = 45 x 67 x 10  100 = (45 x 67)  10 = 3015  10 = 301·5 30·15 = 3015  100 and 3015  45 = 67 (from question) 30·15  45 = 3015  100  45 = (3015  45)  100 =67  100 = 0.67

Using Estimation 5 x 7 = 35 so the answer must be about 35 So 4·5 x 6·7 = 30·15 500 x 0.6 = 300 so the answer must be about 300 4·5 x 6·7 = 301·5 30  45 is a little smaller than 1 and 3015  45 = 67 (from question) So 30·15  45 = 0.67

2·8 = 28  10 and 4·9 = 49  10 so 2·8 x 4·9 = 28  10 x 49  10 = 28 x 49  10  10 = (28 x 49)  100 = 1372  100 = 13·72 14 = 28  2 and 490 = 49 x 10 so 14 x 490 = 28  2 x 49 x 10 = 28 x 49  2 x 10 = (28 x 49) x 5 = 1372 x 5 = 6860 137·2 = 1372  10 and 1372  49 = 28 (from question) 137·2  49 = 1372  10  49 = (1372  49)  10 =28  10 = 2.8

Using Estimation 3 x 5 = 15 so the answer must be about 15 2·8 x 4·9 = 13·72 10 x 500 = 5000 so the answer must be about 5000 14 = 28  2 so you need to half the answer. 1372  2 = 686 so the answer must be 6860 1372  49 = 28 (from question) 100  50 = 2 so the answer must be about 2 137·2  49 = 2.8