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Maths tricks trick 22: Last-digit detective · Set 888 · 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 59 × 21 = 1239 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 13 × 56 = 728 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 563 + 792 = 1351 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 67 × 24 = 1611 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 275 + 137 = 412 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 39 × 44 = 1721 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 85 × 41 = 3485 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 199 + 392 = 584 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 778 + 694 = 1463 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 240 + 861 = 1097 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 302 + 594 = 889 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 25 × 15 = 371 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 240 + 507 = 739 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 573 + 214 = 787 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 81 × 21 = 1695 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 882 + 277 = 1159 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 13 × 40 = 520 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 19 × 69 = 1311 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 678 + 196 = 874 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 44 × 92 = 4053 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 76 × 63 = 4788 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 717 + 578 = 1295 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 16 × 15 = 240 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 413 + 404 = 817 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 890 + 302 = 1192 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 301 + 263 = 557 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 117 + 351 = 473 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 43 × 57 = 2454 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 61 × 88 = 5365 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 91 × 74 = 6741 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 76 × 42 = 3192 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 26 × 43 = 1111 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 44 × 34 = 1489 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 204 + 458 = 662 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 335 + 458 = 791 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 19 × 72 = 1368 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 919 + 712 = 1633 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 55 × 23 = 1265 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 83 × 98 = 8134 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 23 = 437 right or wrong? (a) Wrong (b) Right

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