← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 570 · 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. 2.19² =
  3. 3.23² =
  4. 4.14² =
  5. 5.16² =
  6. 6.28² =
  7. 7.15² =
  8. 8.13² =
  9. 9.26² =
  10. 10.24² =
  11. 11.22² =
  12. 12.17² =
  13. 13.25² =
  14. 14.11² =
  15. 15.18² =
  16. 16.27² =
  17. 17.29² =
  18. 18.12² =
  19. 19.21² =
  20. 20.19² =
  21. 21.21² =
  22. 22.22² =
  23. 23.29² =
  24. 24.14² =
  25. 25.23² =
  26. 26.13² =
  27. 27.29² =
  28. 28.12² =
  29. 29.13² =
  30. 30.16² =
  31. 31.11² =
  32. 32.14² =
  33. 33.13² =
  34. 34.11² =
  35. 35.28² =
  36. 36.13² =
  37. 37.15² =
  38. 38.28² =
  39. 39.15² =
  40. 40.22² =

Answer key

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

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