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Maths tricks trick 22: Last-digit detective · Set 477 · 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 302 + 804 = 1098 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 14 × 60 = 840 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 550 + 566 = 1116 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 61 × 13 = 793 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 64 × 31 = 1990 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 670 + 956 = 1635 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 35 × 12 = 420 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 63 × 73 = 4599 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 16 × 87 = 1392 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 78 × 31 = 2418 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 126 + 562 = 688 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 447 + 555 = 1002 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 638 + 572 = 1210 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 35 × 98 = 3435 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 691 + 191 = 876 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 988 + 896 = 1884 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 45 × 31 = 1395 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 97 × 34 = 3297 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 99 × 35 = 3465 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 98 × 67 = 6564 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 674 + 867 = 1541 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 63 × 71 = 4469 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 46 × 67 = 3082 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 60 × 30 = 1800 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 75 × 45 = 3373 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 92 × 29 = 2676 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 269 + 146 = 413 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 603 + 655 = 1258 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 985 + 762 = 1751 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 370 + 334 = 699 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 26 × 95 = 2470 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 886 + 720 = 1606 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 13 × 75 = 972 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 845 + 654 = 1494 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 853 + 366 = 1219 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 855 + 308 = 1163 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 755 + 515 = 1270 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 16 × 60 = 960 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 859 + 264 = 1128 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 40 × 38 = 1520 right or wrong? (a) Right (b) Wrong

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