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Maths tricks trick 22: Last-digit detective · Set 609 · 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 558 + 230 = 790 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 92 × 72 = 6624 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 85 × 99 = 8412 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 64 × 20 = 1272 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 980 + 572 = 1552 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 419 + 273 = 699 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 106 + 716 = 829 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 80 × 17 = 1360 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 28 × 97 = 2716 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 32 × 29 = 934 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 467 + 193 = 660 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 999 + 716 = 1715 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 897 + 315 = 1212 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 60 × 16 = 960 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 265 + 244 = 509 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 534 + 393 = 927 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 89 × 69 = 6141 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 24 × 60 = 1446 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 255 + 703 = 958 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 609 + 407 = 1016 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 354 + 393 = 753 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 99 × 86 = 8521 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 17 × 79 = 1343 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 288 + 258 = 546 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 699 + 114 = 813 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 383 + 775 = 1158 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 608 + 431 = 1039 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 57 × 46 = 2622 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 308 + 234 = 542 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 42 × 96 = 4032 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 879 + 955 = 1834 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 58 × 31 = 1798 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 49 × 94 = 4606 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 76 × 17 = 1292 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 467 + 451 = 918 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 94 × 66 = 6204 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 56 × 93 = 5208 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 889 + 506 = 1395 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 54 × 50 = 2697 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 70 × 56 = 3920 right or wrong? (a) Right (b) Wrong

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