Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 561 · 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 984 + 529 = 1513 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 320 + 179 = 499 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 784 + 400 = 1191 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 710 + 704 = 1419 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 758 + 604 = 1361 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 99 × 26 = 2576 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 692 + 926 = 1623 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 98 × 16 = 1568 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 51 × 42 = 2142 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 508 + 520 = 1028 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 17 × 77 = 1314 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 225 + 162 = 384 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 133 + 332 = 465 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 325 + 940 = 1265 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 17 × 80 = 1359 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 32 × 69 = 2201 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 59 × 37 = 2183 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 449 + 736 = 1185 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 773 + 967 = 1746 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 65 × 82 = 5321 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 86 × 70 = 6020 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 94 × 15 = 1410 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 18 × 21 = 387 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 63 × 41 = 2583 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 520 + 194 = 720 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 50 × 86 = 4292 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 66 × 34 = 2253 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 632 + 805 = 1437 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 424 + 252 = 676 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 66 × 96 = 6338 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 87 × 75 = 6525 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 169 + 395 = 564 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 865 + 183 = 1048 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 62 × 17 = 1054 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 200 + 829 = 1038 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 767 + 215 = 982 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 137 + 221 = 351 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 426 + 836 = 1262 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 71 × 14 = 988 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 61 × 52 = 3176 right or wrong? (a) Wrong (b) Right

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