Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 212 · 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 33 × 65 = 2145 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 97 × 37 = 3595 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 47 × 51 = 2397 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 12 × 20 = 239 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 708 + 525 = 1235 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 686 + 913 = 1599 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 19 × 18 = 342 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 32 × 64 = 2052 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 313 + 818 = 1137 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 137 + 215 = 352 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 97 × 27 = 2613 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 712 + 338 = 1050 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 282 + 493 = 775 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 42 × 36 = 1506 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 95 × 30 = 2850 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 33 × 56 = 1852 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 232 + 846 = 1078 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 58 × 79 = 4582 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 676 + 281 = 955 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 64 × 21 = 1344 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 52 × 64 = 3328 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 25 × 42 = 1050 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 40 × 69 = 2768 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 84 × 46 = 3864 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 52 × 64 = 3324 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 40 × 30 = 1196 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 65 × 37 = 2401 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 46 × 80 = 3680 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 199 + 315 = 511 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 297 + 617 = 910 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 87 × 34 = 2958 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 573 + 940 = 1513 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 566 + 736 = 1302 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 987 + 980 = 1967 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 18 × 21 = 378 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 60 × 45 = 2704 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 29 × 79 = 2291 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 78 × 73 = 5699 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 208 + 993 = 1201 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 58 × 93 = 5394 right or wrong? (a) Wrong (b) Right

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