Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 516 · 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 21 × 49 = 1030 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 14 × 79 = 1106 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 39 × 72 = 2814 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 304 + 274 = 578 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 323 + 734 = 1057 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 69 × 62 = 4278 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 32 × 35 = 1120 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 61 × 69 = 4218 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 609 + 826 = 1435 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 32 × 38 = 1216 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 73 × 74 = 5402 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 84 × 91 = 7652 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 589 + 479 = 1068 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 281 + 182 = 471 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 560 + 856 = 1416 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 17 × 72 = 1224 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 256 + 164 = 420 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 277 + 723 = 1000 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 795 + 406 = 1201 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 385 + 497 = 891 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 97 × 34 = 3298 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 399 + 657 = 1058 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 590 + 410 = 999 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 27 × 12 = 324 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 589 + 453 = 1042 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 927 + 376 = 1303 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 30 × 82 = 2460 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 510 + 591 = 1099 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 28 × 22 = 616 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 180 + 879 = 1061 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 943 + 423 = 1366 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 85 × 56 = 4760 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 37 × 17 = 635 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 806 + 352 = 1158 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 62 × 42 = 2606 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 58 × 87 = 5046 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 85 × 34 = 2888 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 30 × 14 = 415 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 75 × 77 = 5775 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 73 × 60 = 4380 right or wrong? (a) Right (b) Wrong

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