Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 427 · 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 13 × 64 = 832 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 86 × 78 = 6708 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 482 + 277 = 759 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 73 × 52 = 3796 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 42 × 94 = 3955 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 91 × 29 = 2631 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 22 × 15 = 330 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 12 × 38 = 452 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 89 × 36 = 3202 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 24 × 58 = 1392 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 703 + 502 = 1205 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 20 × 57 = 1146 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 695 + 897 = 1591 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 916 + 355 = 1267 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 125 + 683 = 816 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 37 × 87 = 3219 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 47 × 50 = 2353 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 18 × 17 = 308 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 401 + 107 = 508 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 938 + 688 = 1623 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 332 + 976 = 1308 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 154 + 991 = 1145 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 195 + 439 = 634 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 698 + 620 = 1318 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 98 × 55 = 5390 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 78 × 81 = 6327 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 871 + 549 = 1420 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 683 + 377 = 1064 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 438 + 400 = 832 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 127 + 165 = 295 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 160 + 492 = 646 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 15 × 26 = 390 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 30 × 61 = 1831 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 188 + 232 = 413 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 86 × 42 = 3612 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 26 × 97 = 2513 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 47 × 17 = 799 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 17 × 15 = 261 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 65 × 96 = 6240 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 483 + 648 = 1131 right or wrong? (a) Wrong (b) Right

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