Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 650 · 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 277 + 995 = 1278 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 70 × 95 = 6650 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 36 × 45 = 1620 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 491 + 328 = 819 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 444 + 505 = 949 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 451 + 117 = 575 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 36 × 81 = 2923 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 359 + 296 = 655 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 224 + 343 = 567 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 35 × 29 = 1016 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 24 × 14 = 343 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 35 × 47 = 1644 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 35 × 89 = 3117 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 41 × 81 = 3321 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 52 × 28 = 1449 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 236 + 132 = 368 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 801 + 405 = 1212 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 85 × 58 = 4933 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 789 + 156 = 950 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 60 × 39 = 2337 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 594 + 251 = 845 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 952 + 134 = 1085 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 52 × 35 = 1818 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 460 + 332 = 792 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 24 × 92 = 2215 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 88 × 30 = 2641 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 694 + 480 = 1176 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 35 × 44 = 1536 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 609 + 341 = 950 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 405 + 521 = 926 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 40 × 28 = 1120 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 12 × 95 = 1140 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 86 × 99 = 8514 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 96 × 85 = 8160 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 686 + 326 = 1012 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 256 + 861 = 1117 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 18 × 23 = 416 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 98 × 25 = 2450 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 748 + 505 = 1247 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 15 × 67 = 998 right or wrong? (a) Wrong (b) Right

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