Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 53 · 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 45 × 53 = 2385 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 95 × 73 = 6935 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 54 × 96 = 5184 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 367 + 797 = 1164 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 15 × 93 = 1391 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 996 + 443 = 1439 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 86 × 96 = 8256 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 58 × 91 = 5278 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 45 × 56 = 2520 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 26 × 63 = 1638 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 367 + 343 = 710 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 84 × 88 = 7390 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 732 + 370 = 1101 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 650 + 631 = 1281 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 689 + 540 = 1229 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 29 × 83 = 2408 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 468 + 284 = 752 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 47 × 97 = 4559 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 62 × 17 = 1053 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 66 × 14 = 924 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 777 + 984 = 1761 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 68 × 63 = 4291 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 862 + 148 = 1018 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 217 + 933 = 1150 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 687 + 250 = 937 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 968 + 196 = 1159 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 96 × 97 = 9312 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 984 + 687 = 1671 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 47 × 74 = 3478 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 854 + 354 = 1208 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 18 × 61 = 1098 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 453 + 381 = 834 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 669 + 328 = 1001 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 897 + 305 = 1202 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 14 × 93 = 1302 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 18 × 50 = 900 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 16 × 95 = 1511 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 753 + 284 = 1037 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 48 × 51 = 2440 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 498 + 767 = 1267 right or wrong? (a) Right (b) Wrong

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