Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 943 · 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 65 × 92 = 5980 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 63 × 76 = 4788 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 291 + 817 = 1115 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 80 × 44 = 3520 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 247 + 238 = 488 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 69 × 91 = 6279 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 888 + 391 = 1283 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 644 + 748 = 1391 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 84 × 88 = 7392 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 49 × 69 = 3390 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 98 × 54 = 5284 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 25 × 56 = 1400 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 63 × 48 = 3029 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 49 × 51 = 2496 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 51 × 22 = 1122 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 413 + 219 = 632 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 209 + 626 = 833 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 605 + 592 = 1193 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 62 × 59 = 3658 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 87 × 31 = 2700 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 177 + 379 = 556 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 923 + 879 = 1802 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 21 × 20 = 420 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 180 + 116 = 302 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 610 + 580 = 1190 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 85 × 64 = 5436 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 307 + 169 = 468 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 79 × 33 = 2607 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 86 × 26 = 2241 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 54 × 69 = 3726 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 227 + 183 = 412 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 463 + 201 = 664 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 178 + 264 = 440 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 35 × 32 = 1117 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 654 + 300 = 949 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 600 + 681 = 1280 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 65 × 65 = 4225 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 67 × 76 = 5100 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 20 × 98 = 1960 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 53 × 19 = 1002 right or wrong? (a) Right (b) Wrong

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