Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 301 · 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 97 × 74 = 7187 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 14 × 93 = 1305 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 70 × 33 = 2318 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 799 + 521 = 1320 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 482 + 760 = 1239 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 16 × 33 = 528 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 635 + 842 = 1477 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 78 × 36 = 2811 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 35 × 42 = 1477 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 43 × 34 = 1462 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 40 × 83 = 3315 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 134 + 106 = 240 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 40 × 87 = 3478 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 263 + 523 = 777 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 30 × 66 = 1989 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 86 × 34 = 2933 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 66 × 25 = 1657 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 271 + 681 = 959 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 77 × 32 = 2472 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 48 × 14 = 671 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 782 + 290 = 1069 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 45 × 63 = 2835 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 64 × 28 = 1792 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 477 + 583 = 1066 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 58 × 62 = 3599 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 149 + 697 = 846 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 14 × 25 = 357 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 18 × 14 = 252 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 47 × 42 = 1974 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 554 + 681 = 1235 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 90 × 51 = 4599 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 61 = 1952 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 71 × 23 = 1633 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 13 × 89 = 1162 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 813 + 412 = 1222 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 78 × 22 = 1716 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 674 + 781 = 1451 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 223 + 367 = 588 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 815 + 186 = 1001 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 53 × 32 = 1696 right or wrong? (a) Wrong (b) Right

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