Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 266 · 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 251 + 250 = 509 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 20 × 51 = 1020 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 474 + 791 = 1265 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 78 × 39 = 3042 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 54 × 73 = 3940 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 41 × 98 = 4018 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 375 + 206 = 581 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 654 + 599 = 1258 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 347 + 457 = 804 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 21 × 84 = 1764 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 528 + 646 = 1174 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 95 × 90 = 8550 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 43 × 12 = 516 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 20 × 17 = 341 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 151 + 771 = 924 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 961 + 677 = 1640 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 65 × 72 = 4677 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 255 + 306 = 564 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 42 × 76 = 3192 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 597 + 576 = 1177 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 49 × 41 = 2014 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 521 + 361 = 879 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 184 + 228 = 412 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 18 × 67 = 1198 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 32 × 20 = 640 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 92 × 54 = 4970 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 776 + 424 = 1200 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 763 + 840 = 1602 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 29 × 73 = 2117 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 60 × 75 = 4500 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 14 × 53 = 750 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 77 × 77 = 5925 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 539 + 622 = 1161 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 74 × 64 = 4736 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 876 + 714 = 1590 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 199 + 110 = 309 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 260 + 549 = 815 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 338 + 952 = 1290 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 122 + 415 = 541 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 319 + 959 = 1277 right or wrong? (a) Wrong (b) Right

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