Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 276 · 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 368 + 958 = 1326 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 915 + 580 = 1495 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 195 + 946 = 1141 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 288 + 281 = 569 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 24 × 23 = 552 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 56 × 14 = 784 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 339 + 768 = 1101 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 76 × 61 = 4633 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 262 + 403 = 658 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 78 × 12 = 936 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 256 + 280 = 528 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 185 + 346 = 522 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 132 + 235 = 374 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 258 + 274 = 526 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 830 + 910 = 1736 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 58 × 55 = 3198 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 33 × 68 = 2245 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 86 × 45 = 3878 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 335 + 807 = 1146 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 316 + 247 = 563 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 99 × 95 = 9405 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 37 × 57 = 2100 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 133 + 350 = 484 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 409 + 286 = 695 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 962 + 603 = 1559 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 634 + 757 = 1391 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 56 × 89 = 4986 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 62 × 88 = 5456 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 941 + 783 = 1724 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 210 + 977 = 1180 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 92 × 23 = 2111 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 551 + 190 = 741 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 65 × 60 = 3894 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 27 × 25 = 674 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 292 + 193 = 485 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 77 × 18 = 1386 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 92 × 84 = 7728 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 45 × 18 = 812 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 996 + 234 = 1230 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 997 + 474 = 1471 right or wrong? (a) Wrong (b) Right

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