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Maths tricks trick 22: Last-digit detective · Set 706 · 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 43 × 97 = 4163 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 175 + 535 = 707 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 33 × 78 = 2574 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 995 + 617 = 1607 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 93 × 36 = 3348 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 53 × 81 = 4284 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 72 × 27 = 1944 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 664 + 702 = 1366 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 53 × 37 = 1963 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 99 × 31 = 3076 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 228 + 644 = 872 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 315 + 581 = 896 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 121 + 151 = 272 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 800 + 515 = 1314 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 243 + 304 = 556 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 13 × 90 = 1170 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 202 + 315 = 517 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 126 + 219 = 350 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 902 + 537 = 1439 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 17 × 33 = 557 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 84 × 13 = 1083 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 695 + 216 = 919 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 26 × 82 = 2140 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 74 × 98 = 7252 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 541 + 900 = 1441 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 96 × 26 = 2488 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 26 × 69 = 1801 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 331 + 967 = 1298 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 758 + 989 = 1747 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 62 × 55 = 3403 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 41 × 61 = 2501 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 943 + 114 = 1057 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 98 × 91 = 8918 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 59 × 59 = 3474 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 433 + 267 = 695 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 320 + 220 = 545 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 95 × 41 = 3902 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 928 + 912 = 1840 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 474 + 345 = 819 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 374 + 125 = 507 right or wrong? (a) Wrong (b) Right

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