Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 248 · 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 113 + 658 = 771 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 524 + 606 = 1130 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 90 × 23 = 2070 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 958 + 276 = 1229 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 30 × 83 = 2493 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 59 × 34 = 2006 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 46 × 54 = 2493 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 447 + 432 = 879 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 67 × 20 = 1336 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 758 + 374 = 1132 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 32 × 97 = 3104 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 50 × 99 = 4947 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 194 + 266 = 460 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 804 + 367 = 1171 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 837 + 569 = 1406 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 13 × 81 = 1053 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 98 × 31 = 3038 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 232 + 162 = 385 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 73 × 96 = 7008 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 87 × 31 = 2697 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 55 × 69 = 3799 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 507 + 111 = 618 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 191 + 478 = 669 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 99 × 26 = 2574 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 33 × 91 = 3003 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 168 + 655 = 823 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 51 × 74 = 3774 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 667 + 248 = 915 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 12 × 43 = 516 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 80 × 28 = 2247 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 899 + 191 = 1090 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 76 × 69 = 5250 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 99 × 28 = 2773 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 973 + 361 = 1334 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 204 + 912 = 1116 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 769 + 997 = 1766 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 27 × 39 = 1060 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 80 × 16 = 1289 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 33 × 81 = 2673 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 86 × 18 = 1544 right or wrong? (a) Wrong (b) Right

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