Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 475 · 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 728 + 785 = 1522 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 74 × 29 = 2143 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 198 + 231 = 429 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 688 + 520 = 1208 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 22 × 98 = 2156 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 65 × 22 = 1428 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 88 × 85 = 7480 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 94 × 97 = 9118 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 61 × 34 = 2074 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 33 × 65 = 2145 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 21 × 31 = 649 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 935 + 245 = 1184 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 845 + 708 = 1553 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 29 × 66 = 1916 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 85 × 22 = 1870 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 31 × 22 = 682 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 67 × 32 = 2144 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 28 × 91 = 2548 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 329 + 586 = 915 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 741 + 568 = 1309 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 841 + 212 = 1053 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 55 × 41 = 2255 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 21 × 60 = 1260 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 931 + 314 = 1245 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 22 × 29 = 637 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 145 + 636 = 781 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 86 × 52 = 4467 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 162 + 696 = 860 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 608 + 836 = 1445 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 69 × 54 = 3726 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 293 + 558 = 851 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 781 + 181 = 962 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 619 + 451 = 1074 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 60 × 17 = 1020 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 61 × 57 = 3482 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 83 × 19 = 1578 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 246 + 341 = 587 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 31 × 94 = 2909 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 689 + 200 = 881 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 599 + 429 = 1028 right or wrong? (a) Right (b) Wrong

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