Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 81 · 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 443 + 524 = 967 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 16 × 65 = 1047 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 59 × 96 = 5664 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 531 + 359 = 890 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 767 + 205 = 972 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 190 + 711 = 900 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 46 × 48 = 2208 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 237 + 655 = 892 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 93 × 72 = 6693 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 961 + 144 = 1105 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 12 × 48 = 578 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 856 + 381 = 1230 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 995 + 193 = 1194 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 57 × 64 = 3648 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 845 + 451 = 1296 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 78 × 64 = 4989 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 74 × 85 = 6290 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 87 × 78 = 6786 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 31 × 31 = 961 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 751 + 151 = 904 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 49 × 63 = 3090 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 705 + 442 = 1152 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 24 × 92 = 2208 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 60 × 12 = 720 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 167 + 349 = 516 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 269 + 492 = 761 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 86 × 31 = 2674 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 852 + 222 = 1081 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 334 + 343 = 677 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 785 + 862 = 1640 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 853 + 627 = 1480 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 31 × 64 = 1984 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 159 + 657 = 808 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 411 + 727 = 1134 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 69 × 60 = 4140 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 220 + 860 = 1077 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 60 × 32 = 1920 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 495 + 203 = 699 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 404 + 704 = 1103 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 451 + 804 = 1250 right or wrong? (a) Wrong (b) Right

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