Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 774 · 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 80 × 27 = 2168 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 57 × 50 = 2850 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 83 × 43 = 3569 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 60 = 1920 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 669 + 231 = 907 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 30 × 79 = 2370 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 198 + 363 = 561 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 68 × 92 = 6255 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 196 + 824 = 1014 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 41 × 20 = 820 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 934 + 215 = 1149 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 28 × 20 = 567 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 159 + 416 = 575 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 398 + 776 = 1174 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 740 + 530 = 1270 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 714 + 173 = 887 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 58 × 19 = 1102 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 140 + 578 = 718 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 81 × 68 = 5507 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 41 × 49 = 2010 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 743 + 426 = 1169 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 18 × 64 = 1148 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 683 + 283 = 966 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 524 + 948 = 1472 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 74 × 18 = 1332 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 71 × 20 = 1420 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 652 + 400 = 1052 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 69 × 53 = 3664 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 23 × 54 = 1242 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 75 × 40 = 3000 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 63 × 83 = 5229 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 57 × 98 = 5581 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 362 + 112 = 470 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 96 × 97 = 9305 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 17 × 79 = 1345 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 12 × 86 = 1023 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 88 × 49 = 4312 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 536 + 240 = 781 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 68 × 73 = 4964 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 118 + 449 = 561 right or wrong? (a) Right (b) Wrong

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