Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 834 · 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 58 × 18 = 1044 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 85 × 84 = 7140 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 14 × 34 = 476 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 64 × 96 = 6144 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 13 × 63 = 810 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 16 × 46 = 728 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 553 + 580 = 1133 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 815 + 176 = 991 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 325 + 920 = 1245 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 376 + 405 = 781 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 59 × 19 = 1116 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 99 × 52 = 5155 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 21 × 42 = 882 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 57 × 31 = 1768 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 62 × 87 = 5394 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 51 × 23 = 1173 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 734 + 720 = 1460 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 69 × 82 = 5658 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 489 + 225 = 714 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 30 × 53 = 1590 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 406 + 387 = 793 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 90 × 20 = 1800 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 674 + 735 = 1409 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 347 + 900 = 1251 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 420 + 833 = 1253 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 842 + 224 = 1066 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 207 + 853 = 1066 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 73 × 34 = 2483 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 592 + 139 = 731 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 28 × 46 = 1288 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 797 + 154 = 948 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 776 + 247 = 1023 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 289 + 192 = 476 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 218 + 728 = 946 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 98 × 84 = 8232 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 117 + 352 = 478 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 49 × 93 = 4557 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 34 × 94 = 3191 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 41 × 58 = 2378 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 89 × 24 = 2136 right or wrong? (a) Right (b) Wrong

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