Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 556 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 17 × 98 = 1666 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 88 × 69 = 6065 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 732 + 589 = 1321 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 31 × 77 = 2387 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 546 + 440 = 986 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 238 + 868 = 1106 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 964 + 493 = 1454 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 94 × 21 = 1974 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 394 + 745 = 1133 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 79 × 98 = 7747 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 196 + 683 = 886 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 560 + 292 = 852 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 496 + 908 = 1401 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 45 × 57 = 2565 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 60 × 19 = 1143 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 176 + 240 = 419 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 660 + 680 = 1349 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 205 + 375 = 580 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 206 + 939 = 1144 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 129 + 220 = 349 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 451 + 657 = 1117 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 317 + 299 = 624 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 41 × 61 = 2501 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 335 + 839 = 1169 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 209 + 995 = 1195 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 32 × 69 = 2208 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 85 × 69 = 5860 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 769 + 639 = 1407 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 332 + 878 = 1214 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 35 × 57 = 1997 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 835 + 155 = 983 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 19 × 62 = 1178 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 21 × 33 = 701 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 75 × 73 = 5467 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 45 × 25 = 1133 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 15 × 49 = 735 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 17 × 15 = 255 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 57 × 49 = 2797 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 501 + 449 = 950 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 131 + 599 = 739 right or wrong? (a) Wrong (b) Right

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