Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 433 · 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 39 × 13 = 500 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 573 + 296 = 867 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 91 × 86 = 7826 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 695 + 896 = 1598 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 64 × 96 = 6144 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 19 × 27 = 507 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 32 × 54 = 1728 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 910 + 298 = 1201 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 28 × 44 = 1232 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 54 × 52 = 2805 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 490 + 309 = 808 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 18 × 68 = 1224 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 529 + 483 = 1012 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 750 + 732 = 1482 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 65 × 83 = 5395 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 982 + 240 = 1218 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 73 × 22 = 1606 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 35 × 87 = 3045 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 33 × 62 = 2046 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 23 × 93 = 2139 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 37 × 70 = 2596 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 56 × 54 = 3022 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 32 × 84 = 2691 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 54 × 42 = 2262 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 966 + 196 = 1162 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 17 × 92 = 1564 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 294 + 976 = 1270 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 78 × 53 = 4133 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 41 × 69 = 2825 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 296 + 645 = 941 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 48 × 95 = 4563 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 593 + 683 = 1276 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 640 + 796 = 1440 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 24 × 65 = 1559 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 79 × 90 = 7110 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 55 × 36 = 1973 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 82 × 38 = 3116 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 76 × 31 = 2356 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 606 + 390 = 996 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 20 × 48 = 962 right or wrong? (a) Wrong (b) Right

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