Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 750 · 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 314 + 311 = 625 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 37 × 19 = 712 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 46 × 12 = 552 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 34 × 22 = 750 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 39 × 73 = 2847 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 44 × 88 = 3872 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 801 + 856 = 1657 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 971 + 621 = 1592 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 333 + 805 = 1146 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 566 + 454 = 1018 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 68 × 91 = 6182 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 25 × 29 = 721 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 63 × 78 = 4914 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 268 + 963 = 1237 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 16 × 33 = 520 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 20 × 24 = 480 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 68 × 14 = 952 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 185 + 391 = 570 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 312 + 931 = 1243 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 93 × 57 = 5308 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 677 + 244 = 930 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 40 × 68 = 2720 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 60 × 98 = 5884 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 439 + 144 = 580 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 13 × 13 = 175 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 442 + 848 = 1290 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 26 × 94 = 2438 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 20 × 45 = 908 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 92 × 12 = 1104 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 76 × 29 = 2207 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 200 + 312 = 512 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 96 × 61 = 5856 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 76 × 96 = 7304 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 699 + 220 = 912 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 464 + 345 = 809 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 19 × 79 = 1501 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 722 + 740 = 1462 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 82 × 91 = 7462 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 37 × 76 = 2812 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 856 + 161 = 1021 right or wrong? (a) Wrong (b) Right

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