MATHEMATICS
Multiplying numbers just over/below 100
Multiplying numbers just over/below 100
E.g. : 108 x 109
108 x 109= 11772. The answer is in two parts: 117 and 72
117 = (108+09) or (109+08)
Eg.: 103 x 98(103-2) or (98+3)= 101
(3) x (-2)= (-6)
Combined solution= 10100+ (-6) = 10094
Eg.: 95 x 97
(95-3) or (97-5) = 92
(-5) x (-3)= 15
Combined solution= 9200 + 15= 9215
(3) x (-2)= (-6)
Combined solution= 10100+ (-6) = 10094
Eg.: 95 x 97
(95-3) or (97-5) = 92
(-5) x (-3)= 15
Combined solution= 9200 + 15= 9215
Now try to solve these 10 questions as fast as possible (3-5min)
1. 91 x 106=?
(a) 9706 (b) 9464
(c) 9646 (d) 9644
2. 107 x 109=?
(a) 11683 (b) 10563
(c) 11663 (d) 11563
3. 101 x 95=?
(a) 9605 (b) 9585
(c) 9595 (d) 9505
4. 92 x 103=?
(a) 9406 (b) 9506
(c) 9476 (d) 9774
5. 106 x 109=?
(a) 11445 (b) 11454
(c) 11554 (d) 11544
6. 111x 107=?
(a) 11807 (b) 11787
(c) 10877 (d) 11877
7. 91 x 104=?
(a) 9504 (b) 9464
(c) 9404 (d) 9564
8. 99 x 98=?
(a) 9772 (b) 9702
(c) 9698 (d) 9628
9. 98 x 104=?
(a) 10192 (b) 10232
(c) 10208 (d) 10108
10. 94 x 93=?
(a) 8742 (b) 8658
(c) 8758 (d) 8642
Answers:
1 c 2 c 3 c 4 c 5 d
6 d 7 b 8 b 9 a 10 a
Time taken
Within 3 min: EXCELLENT
3-5 min: YOU CAN DO BETTER
More than 5 min: YOU NEED TO WORK HARD
No comments:
Post a Comment