← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 551 · 40 questions
TalentJR

How to do it in your head ((a + b)²): Split: 27 = 20 + 7. Find 20² = 400, 2 × 20 × 7 = 280 and 7² = 49. Add, biggest first: 400 + 280 + 49.

NameDateTime takenScore ___ / 40
  1. 1.16² =
  2. 2.27² =
  3. 3.11² =
  4. 4.24² =
  5. 5.18² =
  6. 6.21² =
  7. 7.26² =
  8. 8.23² =
  9. 9.14² =
  10. 10.13² =
  11. 11.22² =
  12. 12.15² =
  13. 13.25² =
  14. 14.28² =
  15. 15.19² =
  16. 16.12² =
  17. 17.29² =
  18. 18.19² =
  19. 19.19² =
  20. 20.16² =
  21. 21.18² =
  22. 22.21² =
  23. 23.23² =
  24. 24.29² =
  25. 25.16² =
  26. 26.13² =
  27. 27.14² =
  28. 28.29² =
  29. 29.26² =
  30. 30.17² =
  31. 31.11² =
  32. 32.17² =
  33. 33.11² =
  34. 34.29² =
  35. 35.22² =
  36. 36.12² =
  37. 37.26² =
  38. 38.24² =
  39. 39.14² =
  40. 40.13² =

Answer key

  1. 256
  2. 729
  3. 121
  4. 576
  5. 324
  6. 441
  7. 676
  8. 529
  9. 196
  10. 169
  11. 484
  12. 225
  13. 625
  14. 784
  15. 361
  16. 144
  17. 841
  18. 361
  19. 361
  20. 256
  21. 324
  22. 441
  23. 529
  24. 841
  25. 256
  26. 169
  27. 196
  28. 841
  29. 676
  30. 289
  31. 121
  32. 289
  33. 121
  34. 841
  35. 484
  36. 144
  37. 676
  38. 576
  39. 196
  40. 169

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths