← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 438 · 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. 1.27² =
  2. 2.19² =
  3. 3.18² =
  4. 4.14² =
  5. 5.23² =
  6. 6.21² =
  7. 7.16² =
  8. 8.17² =
  9. 9.12² =
  10. 10.22² =
  11. 11.25² =
  12. 12.11² =
  13. 13.13² =
  14. 14.26² =
  15. 15.29² =
  16. 16.15² =
  17. 17.24² =
  18. 18.12² =
  19. 19.23² =
  20. 20.12² =
  21. 21.28² =
  22. 22.25² =
  23. 23.27² =
  24. 24.11² =
  25. 25.19² =
  26. 26.12² =
  27. 27.17² =
  28. 28.14² =
  29. 29.26² =
  30. 30.13² =
  31. 31.18² =
  32. 32.23² =
  33. 33.24² =
  34. 34.23² =
  35. 35.13² =
  36. 36.25² =
  37. 37.28² =
  38. 38.21² =
  39. 39.18² =
  40. 40.21² =

Answer key

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

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