Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 302 · 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 946 + 236 = 1183 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 12 × 34 = 406 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 79 × 89 = 7022 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 22 = 770 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 33 × 96 = 3167 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 323 + 197 = 520 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 621 + 731 = 1352 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 325 + 708 = 1033 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 783 + 553 = 1339 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 877 + 127 = 1011 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 319 + 535 = 854 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 920 + 493 = 1413 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 48 × 58 = 2784 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 296 + 946 = 1246 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 32 × 88 = 2816 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 575 + 785 = 1360 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 960 + 330 = 1290 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 26 × 84 = 2184 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 52 × 79 = 4109 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 16 × 14 = 224 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 99 × 61 = 6033 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 439 + 350 = 789 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 655 + 494 = 1149 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 49 × 97 = 4754 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 596 + 952 = 1546 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 16 × 64 = 1024 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 87 × 24 = 2088 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 896 + 464 = 1360 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 334 + 575 = 909 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 702 + 921 = 1623 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 76 × 88 = 6688 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 18 × 22 = 399 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 627 + 698 = 1325 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 47 × 66 = 3101 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 27 × 59 = 1593 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 45 × 23 = 1027 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 85 × 56 = 4757 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 56 × 39 = 2184 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 16 × 32 = 517 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 857 + 370 = 1227 right or wrong? (a) Right (b) Wrong

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