← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 81 · 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. 1.19² =
  2. 2.21² =
  3. 3.28² =
  4. 4.11² =
  5. 5.27² =
  6. 6.15² =
  7. 7.16² =
  8. 8.23² =
  9. 9.25² =
  10. 10.12² =
  11. 11.18² =
  12. 12.24² =
  13. 13.13² =
  14. 14.22² =
  15. 15.26² =
  16. 16.14² =
  17. 17.16² =
  18. 18.29² =
  19. 19.16² =
  20. 20.21² =
  21. 21.16² =
  22. 22.12² =
  23. 23.19² =
  24. 24.17² =
  25. 25.23² =
  26. 26.14² =
  27. 27.25² =
  28. 28.19² =
  29. 29.13² =
  30. 30.22² =
  31. 31.14² =
  32. 32.27² =
  33. 33.21² =
  34. 34.15² =
  35. 35.14² =
  36. 36.27² =
  37. 37.18² =
  38. 38.17² =
  39. 39.11² =
  40. 40.16² =

Answer key

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

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