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Maths tricks trick 22: Last-digit detective · Set 238 · 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 321 + 613 = 938 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 19 × 98 = 1871 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 67 × 80 = 5362 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 84 × 70 = 5880 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 24 × 89 = 2136 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 256 + 837 = 1089 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 74 × 36 = 2672 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 368 + 563 = 922 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 658 + 437 = 1093 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 47 × 35 = 1645 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 599 + 577 = 1176 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 811 + 440 = 1251 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 163 + 393 = 550 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 58 × 71 = 4118 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 48 × 15 = 720 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 22 × 78 = 1716 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 427 + 625 = 1052 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 73 × 20 = 1460 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 805 + 392 = 1191 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 61 × 39 = 2379 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 58 × 48 = 2784 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 535 + 755 = 1290 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 590 + 185 = 768 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 230 + 953 = 1183 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 29 × 36 = 1044 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 172 + 686 = 858 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 935 + 312 = 1249 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 41 × 35 = 1436 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 639 + 449 = 1081 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 988 + 511 = 1494 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 235 + 703 = 931 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 476 + 765 = 1240 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 350 + 113 = 458 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 662 + 249 = 911 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 631 + 538 = 1169 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 62 × 67 = 4154 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 606 + 194 = 807 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 27 × 42 = 1133 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 20 = 434 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 12 × 27 = 317 right or wrong? (a) Right (b) Wrong

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