Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 392 · 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 40 × 35 = 1400 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 25 × 22 = 550 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 43 × 45 = 1935 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 53 × 24 = 1272 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 480 + 601 = 1081 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 60 × 64 = 3831 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 894 + 274 = 1168 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 788 + 936 = 1723 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 95 × 52 = 4947 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 924 + 880 = 1804 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 30 × 89 = 2671 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 72 × 40 = 2879 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 15 × 22 = 330 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 385 + 513 = 904 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 59 × 40 = 2360 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 34 × 55 = 1870 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 29 × 81 = 2345 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 275 + 713 = 988 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 693 + 491 = 1184 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 24 × 25 = 600 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 993 + 503 = 1493 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 99 × 36 = 3564 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 948 + 319 = 1268 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 363 + 856 = 1228 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 238 + 210 = 451 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 965 + 432 = 1397 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 420 + 152 = 572 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 997 + 275 = 1272 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 46 × 60 = 2763 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 271 + 358 = 629 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 321 + 284 = 605 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 75 × 48 = 3595 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 359 + 309 = 670 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 915 + 797 = 1712 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 138 + 815 = 957 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 267 + 226 = 493 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 88 × 77 = 6776 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 19 × 93 = 1775 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 95 × 60 = 5700 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 605 + 959 = 1562 right or wrong? (a) Wrong (b) Right

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