Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 400 · 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 56 × 53 = 2960 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 21 × 63 = 1320 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 54 × 83 = 4480 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 50 × 95 = 4750 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 45 × 58 = 2610 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 867 + 124 = 1000 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 955 + 673 = 1633 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 26 × 81 = 2106 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 49 × 68 = 3332 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 93 × 85 = 7905 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 455 + 918 = 1373 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 32 × 20 = 640 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 267 + 395 = 662 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 36 = 824 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 56 × 55 = 3086 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 77 × 70 = 5396 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 147 + 777 = 924 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 98 × 40 = 3920 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 167 + 946 = 1122 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 61 × 46 = 2808 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 363 + 837 = 1205 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 326 + 188 = 514 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 81 × 77 = 6238 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 18 × 90 = 1622 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 420 + 429 = 849 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 775 + 373 = 1148 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 510 + 489 = 999 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 75 × 26 = 1955 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 402 + 888 = 1290 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 59 × 64 = 3781 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 51 × 83 = 4229 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 55 × 17 = 926 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 660 + 775 = 1429 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 154 + 340 = 500 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 42 × 84 = 3530 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 651 + 302 = 960 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 341 + 567 = 908 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 96 × 96 = 9216 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 21 × 19 = 405 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 57 × 14 = 800 right or wrong? (a) Right (b) Wrong

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