Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 978 · 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 713 + 113 = 819 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 662 + 803 = 1462 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 429 + 430 = 855 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 346 + 198 = 548 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 13 × 41 = 531 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 12 × 39 = 468 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 564 + 874 = 1438 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 219 + 607 = 826 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 29 × 18 = 522 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 778 + 592 = 1378 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 220 + 710 = 932 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 37 × 69 = 2553 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 45 × 91 = 4095 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 51 × 67 = 3417 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 76 × 57 = 4332 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 92 × 71 = 6527 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 134 + 141 = 275 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 71 × 29 = 2059 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 88 × 67 = 5896 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 23 × 83 = 1903 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 31 × 84 = 2604 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 325 + 561 = 891 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 79 × 79 = 6241 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 794 + 273 = 1070 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 738 + 412 = 1150 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 305 + 785 = 1082 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 23 × 44 = 1012 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 72 × 96 = 6904 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 776 + 288 = 1068 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 664 + 321 = 985 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 32 × 79 = 2522 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 929 + 383 = 1310 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 51 × 71 = 3621 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 360 + 317 = 677 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 68 × 51 = 3467 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 122 + 969 = 1091 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 116 + 345 = 469 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 59 × 89 = 5251 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 12 × 22 = 257 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 27 × 88 = 2383 right or wrong? (a) Right (b) Wrong

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