Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 4 · 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 164 + 317 = 481 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 37 × 92 = 3404 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 731 + 422 = 1156 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 68 × 18 = 1224 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 89 × 12 = 1068 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 246 + 797 = 1043 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 73 × 97 = 7081 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 90 × 74 = 6660 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 493 + 573 = 1066 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 42 × 12 = 503 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 347 + 614 = 961 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 16 × 46 = 736 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 88 × 48 = 4224 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 77 × 91 = 7000 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 571 + 839 = 1405 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 369 + 422 = 789 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 184 + 267 = 451 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 18 × 41 = 734 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 36 × 48 = 1728 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 21 × 33 = 693 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 18 × 29 = 522 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 48 × 65 = 3119 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 323 + 741 = 1072 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 40 × 17 = 680 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 208 + 311 = 526 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 44 × 55 = 2420 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 97 × 37 = 3589 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 13 × 54 = 694 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 28 × 20 = 568 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 12 × 36 = 425 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 12 × 27 = 324 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 48 × 86 = 4125 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 88 × 71 = 6248 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 683 + 662 = 1345 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 187 + 506 = 689 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 600 + 277 = 877 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 21 × 54 = 1134 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 88 × 69 = 6072 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 118 + 980 = 1096 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 980 + 337 = 1317 right or wrong? (a) Right (b) Wrong

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