Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 726 · 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 644 + 471 = 1110 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 962 + 983 = 1942 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 74 × 76 = 5621 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 981 + 753 = 1739 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 249 + 831 = 1080 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 21 × 66 = 1386 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 86 × 26 = 2230 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 433 + 688 = 1114 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 234 + 587 = 821 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 210 + 266 = 476 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 198 + 593 = 791 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 78 × 86 = 6708 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 802 + 458 = 1258 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 38 × 18 = 684 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 56 × 76 = 4250 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 49 × 68 = 3335 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 94 × 31 = 2914 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 812 + 396 = 1207 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 63 × 99 = 6243 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 436 + 390 = 818 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 453 + 638 = 1091 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 46 × 49 = 2261 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 79 × 16 = 1264 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 850 + 434 = 1279 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 150 + 228 = 378 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 96 × 30 = 2880 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 62 × 64 = 3968 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 55 × 35 = 1924 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 88 × 39 = 3432 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 844 + 641 = 1485 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 25 × 80 = 2002 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 270 + 995 = 1265 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 45 × 28 = 1252 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 743 + 305 = 1048 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 309 + 579 = 888 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 20 × 80 = 1608 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 24 × 23 = 552 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 765 + 311 = 1076 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 971 + 909 = 1875 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 507 + 387 = 901 right or wrong? (a) Right (b) Wrong

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