← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 400 · 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. 2.22² =
  3. 3.26² =
  4. 4.16² =
  5. 5.29² =
  6. 6.15² =
  7. 7.23² =
  8. 8.21² =
  9. 9.12² =
  10. 10.27² =
  11. 11.24² =
  12. 12.18² =
  13. 13.21² =
  14. 14.19² =
  15. 15.17² =
  16. 16.13² =
  17. 17.14² =
  18. 18.25² =
  19. 19.24² =
  20. 20.23² =
  21. 21.11² =
  22. 22.21² =
  23. 23.21² =
  24. 24.29² =
  25. 25.28² =
  26. 26.15² =
  27. 27.27² =
  28. 28.23² =
  29. 29.19² =
  30. 30.29² =
  31. 31.25² =
  32. 32.26² =
  33. 33.16² =
  34. 34.24² =
  35. 35.21² =
  36. 36.16² =
  37. 37.19² =
  38. 38.18² =
  39. 39.16² =
  40. 40.16² =

Answer key

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

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