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Maths tricks trick 22: Last-digit detective · Set 434 · 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 64 × 48 = 3072 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 243 + 841 = 1085 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 980 + 949 = 1934 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 837 + 772 = 1609 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 40 × 16 = 649 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 362 + 401 = 767 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 641 + 723 = 1364 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 41 × 12 = 492 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 689 + 610 = 1299 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 45 × 23 = 1035 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 427 + 204 = 631 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 746 + 209 = 955 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 21 × 65 = 1365 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 64 × 96 = 6144 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 60 × 37 = 2220 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 35 × 80 = 2804 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 87 × 26 = 2262 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 44 × 78 = 3432 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 282 + 777 = 1059 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 656 + 928 = 1582 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 49 × 45 = 2199 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 825 + 170 = 993 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 88 × 92 = 8096 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 411 + 112 = 530 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 615 + 345 = 957 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 83 × 16 = 1328 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 777 + 869 = 1639 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 28 × 45 = 1263 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 774 + 507 = 1281 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 62 × 97 = 6017 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 56 × 25 = 1399 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 744 + 176 = 920 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 85 × 36 = 3060 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 159 + 162 = 321 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 74 × 40 = 2960 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 24 × 66 = 1584 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 35 × 40 = 1400 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 108 + 798 = 906 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 46 × 21 = 971 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 66 × 16 = 1047 right or wrong? (a) Wrong (b) Right

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