Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 936 · 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 97 × 38 = 3683 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 19 × 37 = 703 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 73 × 22 = 1606 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 59 × 71 = 4192 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 580 + 897 = 1477 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 64 × 84 = 5376 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 356 + 980 = 1336 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 45 × 30 = 1358 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 35 × 52 = 1820 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 534 + 862 = 1396 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 356 + 493 = 848 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 905 + 639 = 1539 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 454 + 819 = 1273 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 378 + 877 = 1255 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 85 × 58 = 4930 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 352 + 799 = 1151 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 548 + 660 = 1208 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 228 + 179 = 405 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 74 × 40 = 2960 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 92 × 76 = 6992 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 43 × 52 = 2238 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 343 + 564 = 907 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 74 × 20 = 1480 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 635 + 771 = 1409 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 654 + 390 = 1042 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 87 × 13 = 1131 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 284 + 239 = 523 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 91 × 40 = 3640 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 78 × 60 = 4680 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 56 × 61 = 3416 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 767 + 895 = 1662 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 878 + 141 = 1023 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 58 × 85 = 4926 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 461 + 938 = 1397 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 36 × 50 = 1800 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 188 + 883 = 1079 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 171 + 112 = 283 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 170 + 329 = 499 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 886 + 274 = 1160 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 41 × 45 = 1850 right or wrong? (a) Wrong (b) Right

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