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Maths tricks trick 22: Last-digit detective · Set 513 · 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 661 + 853 = 1509 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 81 × 65 = 5264 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 953 + 291 = 1239 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 143 + 298 = 441 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 624 + 639 = 1260 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 24 × 46 = 1104 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 214 + 292 = 515 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 347 + 401 = 748 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 747 + 716 = 1462 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 85 × 48 = 4076 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 83 × 26 = 2160 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 78 × 34 = 2652 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 609 + 748 = 1357 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 152 + 801 = 953 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 32 × 42 = 1344 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 253 + 971 = 1227 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 98 × 25 = 2450 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 974 + 767 = 1741 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 266 + 898 = 1164 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 45 × 53 = 2385 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 26 × 79 = 2046 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 465 + 817 = 1282 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 30 × 40 = 1191 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 619 + 384 = 1007 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 276 + 344 = 616 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 70 × 77 = 5388 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 815 + 983 = 1792 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 45 × 78 = 3513 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 956 + 730 = 1684 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 360 + 265 = 619 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 465 + 215 = 680 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 13 × 74 = 962 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 97 × 97 = 9409 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 83 × 12 = 996 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 31 × 60 = 1863 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 43 × 35 = 1499 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 898 + 881 = 1770 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 83 × 49 = 4067 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 200 + 953 = 1149 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 28 × 90 = 2520 right or wrong? (a) Wrong (b) Right

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