← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 119 · 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. 1.21² =
  2. 2.16² =
  3. 3.18² =
  4. 4.22² =
  5. 5.12² =
  6. 6.17² =
  7. 7.23² =
  8. 8.27² =
  9. 9.19² =
  10. 10.11² =
  11. 11.26² =
  12. 12.29² =
  13. 13.14² =
  14. 14.28² =
  15. 15.21² =
  16. 16.13² =
  17. 17.25² =
  18. 18.15² =
  19. 19.21² =
  20. 20.24² =
  21. 21.21² =
  22. 22.27² =
  23. 23.24² =
  24. 24.26² =
  25. 25.23² =
  26. 26.23² =
  27. 27.21² =
  28. 28.22² =
  29. 29.26² =
  30. 30.25² =
  31. 31.28² =
  32. 32.27² =
  33. 33.14² =
  34. 34.23² =
  35. 35.12² =
  36. 36.24² =
  37. 37.14² =
  38. 38.21² =
  39. 39.15² =
  40. 40.21² =

Answer key

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

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