← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 419 · 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. 1.14² =
  2. 2.27² =
  3. 3.16² =
  4. 4.29² =
  5. 5.22² =
  6. 6.24² =
  7. 7.21² =
  8. 8.15² =
  9. 9.17² =
  10. 10.25² =
  11. 11.19² =
  12. 12.28² =
  13. 13.23² =
  14. 14.26² =
  15. 15.18² =
  16. 16.13² =
  17. 17.26² =
  18. 18.11² =
  19. 19.26² =
  20. 20.12² =
  21. 21.21² =
  22. 22.27² =
  23. 23.11² =
  24. 24.23² =
  25. 25.18² =
  26. 26.16² =
  27. 27.23² =
  28. 28.11² =
  29. 29.12² =
  30. 30.18² =
  31. 31.29² =
  32. 32.23² =
  33. 33.15² =
  34. 34.12² =
  35. 35.21² =
  36. 36.11² =
  37. 37.22² =
  38. 38.15² =
  39. 39.27² =
  40. 40.27² =

Answer key

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

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