Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 260 · 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 96 × 57 = 5472 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 811 + 858 = 1669 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 20 × 54 = 1075 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 82 × 79 = 6478 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 127 + 194 = 321 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 63 × 92 = 5796 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 315 + 123 = 442 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 546 + 711 = 1251 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 754 + 145 = 899 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 854 + 398 = 1254 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 893 + 584 = 1477 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 246 + 205 = 456 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 37 × 60 = 2226 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 186 + 186 = 372 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 693 + 917 = 1617 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 46 × 16 = 736 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 54 × 61 = 3294 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 276 + 654 = 930 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 408 + 129 = 541 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 628 + 706 = 1334 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 204 + 952 = 1165 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 55 × 51 = 2805 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 32 × 22 = 709 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 938 + 931 = 1869 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 41 × 83 = 3403 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 626 + 930 = 1558 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 448 + 631 = 1079 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 985 + 734 = 1719 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 74 × 65 = 4802 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 905 + 663 = 1568 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 76 × 45 = 3420 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 64 × 78 = 4992 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 591 + 488 = 1079 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 147 + 808 = 957 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 753 + 173 = 921 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 34 × 60 = 2040 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 336 + 428 = 764 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 56 × 95 = 5322 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 30 × 70 = 2094 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 552 + 487 = 1039 right or wrong? (a) Wrong (b) Right

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