Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 456 · 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 20 × 82 = 1643 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 642 + 877 = 1521 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 442 + 346 = 788 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 45 = 1575 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 44 × 82 = 3609 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 68 × 73 = 4964 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 80 × 38 = 3048 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 657 + 567 = 1226 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 87 × 83 = 7221 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 92 × 88 = 8094 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 53 × 69 = 3655 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 893 + 770 = 1656 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 29 × 82 = 2378 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 69 × 38 = 2625 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 201 + 278 = 484 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 330 + 327 = 657 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 74 × 19 = 1406 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 15 × 56 = 840 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 24 × 47 = 1128 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 86 × 32 = 2749 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 373 + 211 = 584 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 62 × 32 = 1984 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 549 + 208 = 757 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 85 × 19 = 1621 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 36 × 90 = 3240 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 515 + 569 = 1079 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 92 × 77 = 7084 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 939 + 112 = 1051 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 24 × 91 = 2184 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 67 × 28 = 1876 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 30 × 71 = 2130 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 39 × 34 = 1329 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 57 × 32 = 1819 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 228 + 374 = 602 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 50 × 59 = 2955 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 74 × 55 = 4070 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 45 × 83 = 3735 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 515 + 720 = 1235 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 364 + 703 = 1067 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 574 + 354 = 928 right or wrong? (a) Right (b) Wrong

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