Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 268 · 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 52 × 41 = 2130 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 46 × 33 = 1518 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 409 + 465 = 874 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 446 + 954 = 1400 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 66 × 67 = 4422 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 82 × 84 = 6888 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 26 × 77 = 2002 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 248 + 211 = 459 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 67 × 38 = 2546 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 31 × 33 = 1023 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 720 + 673 = 1393 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 955 + 155 = 1111 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 14 × 24 = 336 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 50 × 14 = 697 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 53 × 31 = 1643 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 88 × 68 = 5982 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 300 + 784 = 1081 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 26 × 50 = 1302 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 585 + 272 = 859 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 184 + 719 = 903 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 981 + 201 = 1182 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 18 × 65 = 1170 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 236 + 164 = 397 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 85 × 13 = 1097 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 89 × 80 = 7120 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 94 × 83 = 7802 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 48 × 65 = 3120 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 61 × 32 = 1952 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 37 × 86 = 3187 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 194 + 736 = 936 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 31 × 22 = 682 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 619 + 365 = 984 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 18 × 57 = 1026 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 510 + 318 = 826 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 46 × 24 = 1111 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 215 + 286 = 501 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 65 × 35 = 2276 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 528 + 186 = 711 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 429 + 158 = 588 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 591 + 732 = 1317 right or wrong? (a) Right (b) Wrong

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