Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 557 · 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 29 × 92 = 2668 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 52 × 29 = 1517 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 99 × 78 = 7720 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 80 × 74 = 5927 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 223 + 167 = 390 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 85 × 39 = 3315 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 23 × 77 = 1771 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 13 × 21 = 273 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 119 + 383 = 505 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 80 × 24 = 1927 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 85 × 87 = 7395 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 182 + 986 = 1169 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 700 + 318 = 1018 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 56 × 20 = 1120 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 25 × 76 = 1895 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 243 + 275 = 518 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 501 + 175 = 676 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 410 + 167 = 577 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 51 × 84 = 4289 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 863 + 483 = 1343 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 22 × 38 = 836 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 892 + 449 = 1346 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 95 × 89 = 8453 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 125 + 217 = 333 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 128 + 333 = 461 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 903 + 870 = 1770 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 42 × 66 = 2769 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 81 × 14 = 1134 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 331 + 712 = 1035 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 891 + 363 = 1260 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 12 × 85 = 1020 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 208 + 347 = 560 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 434 + 380 = 814 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 19 × 30 = 570 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 57 × 93 = 5301 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 354 + 119 = 482 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 63 × 17 = 1068 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 740 + 384 = 1124 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 548 + 278 = 818 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 73 × 43 = 3139 right or wrong? (a) Wrong (b) Right

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