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Maths tricks trick 22: Last-digit detective · Set 924 · 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 907 + 667 = 1580 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 806 + 628 = 1429 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 870 + 163 = 1033 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 30 × 37 = 1101 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 61 × 55 = 3360 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 14 × 71 = 993 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 720 + 168 = 888 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 64 × 52 = 3333 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 97 × 49 = 4749 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 122 + 222 = 340 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 51 × 71 = 3619 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 84 × 90 = 7555 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 27 × 93 = 2509 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 687 + 557 = 1251 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 941 + 670 = 1610 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 37 × 83 = 3071 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 282 + 631 = 913 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 15 × 63 = 944 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 663 + 771 = 1440 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 699 + 154 = 855 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 803 + 568 = 1371 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 68 × 23 = 1564 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 24 × 67 = 1608 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 621 + 132 = 746 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 240 + 853 = 1095 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 197 + 777 = 969 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 92 × 59 = 5436 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 71 × 20 = 1420 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 32 × 97 = 3111 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 830 + 638 = 1474 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 61 × 41 = 2501 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 409 + 959 = 1363 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 25 × 98 = 2450 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 712 + 399 = 1111 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 236 + 156 = 392 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 884 + 454 = 1331 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 754 + 198 = 950 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 20 × 61 = 1220 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 22 × 51 = 1118 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 43 × 45 = 1935 right or wrong? (a) Wrong (b) Right

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