Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 533 · 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 265 + 556 = 821 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 293 + 229 = 522 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 37 × 77 = 2849 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 379 + 403 = 782 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 171 + 639 = 816 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 277 + 869 = 1147 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 842 + 803 = 1636 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 84 × 19 = 1596 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 67 × 34 = 2278 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 63 × 19 = 1197 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 293 + 341 = 633 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 81 × 24 = 1944 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 42 × 76 = 3192 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 220 + 287 = 507 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 83 × 56 = 4648 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 33 × 74 = 2442 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 838 + 247 = 1085 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 55 × 23 = 1265 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 80 × 21 = 1681 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 798 + 346 = 1144 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 23 × 32 = 736 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 39 × 19 = 741 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 381 + 297 = 678 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 226 + 309 = 535 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 70 × 59 = 4130 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 815 + 875 = 1686 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 53 × 65 = 3445 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 24 × 12 = 288 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 631 + 370 = 1001 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 329 + 257 = 586 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 13 × 14 = 182 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 471 + 707 = 1178 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 52 × 35 = 1812 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 138 + 804 = 948 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 97 × 76 = 7379 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 58 × 95 = 5513 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 546 + 234 = 780 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 460 + 967 = 1427 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 844 + 943 = 1784 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 60 × 41 = 2465 right or wrong? (a) Right (b) Wrong

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