Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 844 · 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 41 × 29 = 1194 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 18 × 47 = 846 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 893 + 672 = 1565 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 879 + 473 = 1344 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 430 + 759 = 1191 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 478 + 219 = 689 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 424 + 286 = 710 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 684 + 698 = 1381 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 436 + 331 = 766 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 86 × 16 = 1376 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 421 + 209 = 630 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 745 + 337 = 1082 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 25 × 87 = 2174 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 13 × 88 = 1144 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 846 + 514 = 1355 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 77 × 32 = 2464 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 47 × 91 = 4277 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 356 + 494 = 851 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 63 × 82 = 5166 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 565 + 469 = 1034 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 788 + 422 = 1210 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 142 + 960 = 1102 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 576 + 145 = 721 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 675 + 115 = 790 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 520 + 932 = 1454 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 98 × 18 = 1763 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 46 × 15 = 682 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 81 × 26 = 2109 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 469 + 308 = 777 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 106 + 489 = 595 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 60 × 64 = 3840 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 80 × 65 = 5204 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 35 × 19 = 656 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 72 × 50 = 3600 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 85 × 77 = 6545 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 93 × 55 = 5119 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 391 + 196 = 589 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 42 × 97 = 4071 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 74 × 69 = 5107 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 623 + 841 = 1456 right or wrong? (a) Wrong (b) Right

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