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Maths tricks trick 22: Last-digit detective · Set 147 · 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 14 × 96 = 1344 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 30 × 95 = 2842 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 78 × 40 = 3120 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 56 × 61 = 3416 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 14 × 12 = 172 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 356 + 579 = 933 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 23 × 66 = 1517 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 66 × 61 = 4024 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 930 + 366 = 1287 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 661 + 681 = 1345 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 294 + 283 = 577 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 19 × 90 = 1710 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 267 + 503 = 770 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 231 + 372 = 603 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 279 + 220 = 496 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 77 × 46 = 3549 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 59 × 13 = 771 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 361 + 946 = 1316 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 430 + 587 = 1017 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 63 × 57 = 3600 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 935 + 431 = 1357 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 43 × 22 = 946 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 37 × 28 = 1036 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 26 × 64 = 1664 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 96 × 82 = 7872 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 749 + 640 = 1389 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 93 × 80 = 7440 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 267 + 773 = 1040 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 988 + 993 = 1976 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 958 + 441 = 1399 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 66 × 41 = 2706 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 24 × 96 = 2304 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 670 + 846 = 1520 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 768 + 683 = 1451 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 57 × 72 = 4103 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 222 + 695 = 912 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 977 + 578 = 1555 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 84 × 88 = 7392 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 703 + 642 = 1345 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 317 + 246 = 563 right or wrong? (a) Right (b) Wrong

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