← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 890 · 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. 1.11² =
  2. 2.21² =
  3. 3.29² =
  4. 4.14² =
  5. 5.13² =
  6. 6.27² =
  7. 7.19² =
  8. 8.28² =
  9. 9.15² =
  10. 10.25² =
  11. 11.16² =
  12. 12.22² =
  13. 13.12² =
  14. 14.24² =
  15. 15.18² =
  16. 16.17² =
  17. 17.28² =
  18. 18.26² =
  19. 19.24² =
  20. 20.11² =
  21. 21.12² =
  22. 22.21² =
  23. 23.23² =
  24. 24.29² =
  25. 25.22² =
  26. 26.26² =
  27. 27.14² =
  28. 28.23² =
  29. 29.27² =
  30. 30.25² =
  31. 31.12² =
  32. 32.25² =
  33. 33.11² =
  34. 34.14² =
  35. 35.26² =
  36. 36.29² =
  37. 37.11² =
  38. 38.21² =
  39. 39.15² =
  40. 40.13² =

Answer key

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

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