Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 703 · 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 46 × 41 = 1891 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 28 × 47 = 1314 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 40 × 68 = 2720 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 70 × 62 = 4340 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 53 × 22 = 1166 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 95 × 52 = 4942 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 68 × 26 = 1768 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 562 + 114 = 676 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 133 + 925 = 1064 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 69 × 15 = 1035 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 548 + 738 = 1286 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 614 + 242 = 847 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 54 × 17 = 919 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 61 × 29 = 1776 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 27 × 53 = 1431 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 525 + 634 = 1159 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 85 × 80 = 6800 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 56 × 65 = 3641 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 632 + 197 = 828 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 83 × 76 = 6310 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 82 × 97 = 7949 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 358 + 543 = 901 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 553 + 469 = 1022 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 26 × 88 = 2289 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 94 × 64 = 6014 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 32 × 78 = 2496 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 65 × 38 = 2470 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 99 × 18 = 1781 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 29 × 94 = 2731 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 116 + 969 = 1078 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 705 + 282 = 978 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 877 + 228 = 1105 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 80 × 63 = 5040 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 63 × 30 = 1891 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 95 × 60 = 5709 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 991 + 308 = 1299 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 545 + 434 = 974 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 450 + 221 = 678 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 75 × 55 = 4122 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 64 × 85 = 5440 right or wrong? (a) Right (b) Wrong

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