Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 908 · 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 453 + 215 = 665 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 50 × 17 = 850 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 179 + 609 = 780 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 552 + 792 = 1344 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 76 × 43 = 3262 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 840 + 760 = 1606 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 935 + 336 = 1271 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 68 × 77 = 5236 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 440 + 478 = 921 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 296 + 857 = 1161 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 152 + 395 = 547 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 47 × 97 = 4559 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 67 × 47 = 3145 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 424 + 295 = 712 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 94 × 53 = 4982 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 71 × 25 = 1775 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 48 × 14 = 671 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 251 + 718 = 963 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 48 × 22 = 1055 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 73 × 29 = 2117 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 229 + 870 = 1090 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 776 + 743 = 1522 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 99 × 36 = 3564 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 823 + 837 = 1660 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 96 × 48 = 4608 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 44 × 34 = 1496 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 506 + 829 = 1334 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 471 + 158 = 623 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 731 + 648 = 1379 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 996 + 371 = 1367 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 31 × 84 = 2604 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 743 + 314 = 1049 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 770 + 152 = 923 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 59 × 83 = 4897 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 47 × 65 = 3055 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 344 + 900 = 1244 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 58 × 15 = 870 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 73 × 70 = 5110 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 61 × 98 = 5971 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 13 × 16 = 208 right or wrong? (a) Wrong (b) Right

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