Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 398 · 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 88 × 75 = 6592 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 87 × 50 = 4346 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 26 × 53 = 1378 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 77 × 73 = 5618 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 986 + 367 = 1351 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 67 × 68 = 4556 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 60 × 31 = 1865 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 891 + 167 = 1066 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 561 + 461 = 1024 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 708 + 341 = 1049 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 736 + 175 = 909 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 124 + 853 = 977 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 451 + 387 = 838 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 352 + 647 = 999 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 73 × 77 = 5616 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 31 × 18 = 565 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 57 × 58 = 3310 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 15 × 78 = 1170 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 945 + 374 = 1319 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 29 × 91 = 2638 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 29 × 20 = 587 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 767 + 179 = 949 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 786 + 765 = 1547 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 12 × 93 = 1116 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 36 × 88 = 3168 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 28 × 47 = 1316 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 728 + 856 = 1584 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 46 × 97 = 4455 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 261 + 118 = 379 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 392 + 500 = 888 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 34 × 61 = 2074 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 60 × 49 = 2943 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 305 + 320 = 625 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 47 × 96 = 4512 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 40 × 32 = 1281 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 426 + 556 = 981 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 108 + 272 = 380 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 408 + 695 = 1107 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 73 × 36 = 2637 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 20 × 40 = 800 right or wrong? (a) Right (b) Wrong

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