Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 895 · 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 968 + 503 = 1477 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 630 + 968 = 1598 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 447 + 315 = 762 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 117 + 868 = 985 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 182 + 228 = 410 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 20 × 30 = 596 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 312 + 957 = 1269 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 61 × 59 = 3599 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 697 + 176 = 873 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 20 × 79 = 1573 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 57 × 36 = 2052 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 464 + 721 = 1189 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 76 × 26 = 1968 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 98 × 65 = 6370 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 13 × 89 = 1157 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 20 × 80 = 1600 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 50 × 76 = 3800 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 86 × 31 = 2666 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 48 × 33 = 1584 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 748 + 109 = 857 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 87 × 41 = 3567 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 23 × 94 = 2168 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 91 × 81 = 7373 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 880 + 993 = 1873 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 466 + 251 = 717 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 596 + 493 = 1089 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 798 + 457 = 1261 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 67 × 28 = 1876 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 772 + 789 = 1561 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 98 × 97 = 9505 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 25 × 58 = 1450 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 328 + 375 = 712 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 68 × 63 = 4284 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 173 + 485 = 658 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 72 × 27 = 1944 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 23 × 15 = 345 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 181 + 495 = 676 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 64 × 46 = 2946 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 17 × 60 = 1023 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 41 × 78 = 3195 right or wrong? (a) Wrong (b) Right

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