Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 253 · 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 72 × 25 = 1800 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 948 + 396 = 1344 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 940 + 926 = 1866 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 68 × 52 = 3536 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 868 + 884 = 1752 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 38 × 81 = 3085 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 12 × 84 = 1008 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 85 × 20 = 1700 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 216 + 973 = 1189 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 402 + 527 = 927 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 57 × 34 = 1943 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 31 × 38 = 1178 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 905 + 894 = 1799 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 72 × 22 = 1584 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 41 × 39 = 1599 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 996 + 883 = 1879 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 751 + 938 = 1689 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 513 + 834 = 1349 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 34 × 41 = 1394 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 41 × 38 = 1563 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 84 × 45 = 3780 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 77 × 48 = 3696 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 578 + 173 = 755 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 124 + 143 = 267 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 99 × 61 = 6039 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 359 + 826 = 1185 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 82 × 24 = 1969 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 611 + 635 = 1251 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 281 + 374 = 649 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 215 + 420 = 643 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 315 + 617 = 924 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 691 + 881 = 1573 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 550 + 124 = 674 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 69 × 24 = 1652 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 79 × 98 = 7740 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 332 + 823 = 1158 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 37 × 46 = 1702 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 228 + 855 = 1083 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 17 × 30 = 510 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 156 + 461 = 617 right or wrong? (a) Right (b) Wrong

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