Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 328 · 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 530 + 290 = 819 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 50 × 18 = 903 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 46 × 89 = 4095 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 417 + 370 = 795 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 182 + 254 = 444 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 18 × 49 = 886 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 367 + 590 = 953 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 78 × 69 = 5387 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 38 × 24 = 918 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 800 + 181 = 981 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 44 × 92 = 4051 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 93 × 96 = 8928 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 47 × 38 = 1786 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 462 + 502 = 960 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 276 + 759 = 1035 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 63 × 15 = 945 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 70 × 30 = 2100 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 35 × 46 = 1608 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 790 + 283 = 1081 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 93 × 95 = 8844 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 23 × 75 = 1717 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 23 × 13 = 298 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 31 × 15 = 465 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 516 + 501 = 1020 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 36 × 25 = 893 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 189 + 883 = 1068 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 56 × 34 = 1902 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 94 × 72 = 6768 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 20 × 14 = 280 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 18 × 90 = 1620 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 36 × 97 = 3490 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 307 + 768 = 1083 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 783 + 458 = 1241 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 45 × 65 = 2925 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 384 + 785 = 1171 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 54 × 31 = 1674 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 57 × 52 = 2964 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 26 × 72 = 1880 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 257 + 603 = 860 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 54 × 29 = 1566 right or wrong? (a) Wrong (b) Right

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