← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 408 · 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. 1.28² =
  2. 2.19² =
  3. 3.26² =
  4. 4.21² =
  5. 5.15² =
  6. 6.22² =
  7. 7.14² =
  8. 8.16² =
  9. 9.18² =
  10. 10.12² =
  11. 11.13² =
  12. 12.17² =
  13. 13.29² =
  14. 14.23² =
  15. 15.25² =
  16. 16.11² =
  17. 17.27² =
  18. 18.23² =
  19. 19.24² =
  20. 20.14² =
  21. 21.12² =
  22. 22.22² =
  23. 23.29² =
  24. 24.26² =
  25. 25.22² =
  26. 26.11² =
  27. 27.29² =
  28. 28.28² =
  29. 29.11² =
  30. 30.13² =
  31. 31.24² =
  32. 32.11² =
  33. 33.21² =
  34. 34.25² =
  35. 35.13² =
  36. 36.21² =
  37. 37.26² =
  38. 38.22² =
  39. 39.21² =
  40. 40.16² =

Answer key

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

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