Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 975 · 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 91 × 45 = 4094 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 120 + 822 = 942 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 36 × 69 = 2484 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 612 + 497 = 1109 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 722 + 429 = 1151 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 871 + 889 = 1755 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 200 + 764 = 964 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 44 × 59 = 2588 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 79 × 12 = 948 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 39 × 98 = 3822 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 691 + 263 = 963 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 162 + 917 = 1080 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 43 × 77 = 3311 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 932 + 436 = 1375 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 718 + 823 = 1541 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 29 × 61 = 1771 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 32 × 15 = 482 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 55 × 40 = 2200 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 319 + 904 = 1218 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 598 + 583 = 1181 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 37 × 50 = 1851 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 39 × 19 = 741 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 682 + 118 = 800 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 995 + 490 = 1485 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 47 × 98 = 4611 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 91 × 22 = 2010 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 32 × 66 = 2112 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 393 + 458 = 850 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 716 + 878 = 1594 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 842 + 615 = 1457 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 435 + 145 = 588 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 341 + 359 = 704 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 20 × 37 = 740 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 21 × 94 = 1974 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 720 + 298 = 1011 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 78 × 49 = 3822 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 74 × 91 = 6734 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 868 + 193 = 1061 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 795 + 550 = 1354 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 308 + 686 = 994 right or wrong? (a) Right (b) Wrong

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