← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 397 · 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. 1.26² =
  2. 2.28² =
  3. 3.15² =
  4. 4.24² =
  5. 5.14² =
  6. 6.17² =
  7. 7.11² =
  8. 8.23² =
  9. 9.18² =
  10. 10.13² =
  11. 11.22² =
  12. 12.12² =
  13. 13.25² =
  14. 14.27² =
  15. 15.19² =
  16. 16.16² =
  17. 17.16² =
  18. 18.29² =
  19. 19.21² =
  20. 20.15² =
  21. 21.28² =
  22. 22.14² =
  23. 23.21² =
  24. 24.15² =
  25. 25.16² =
  26. 26.16² =
  27. 27.18² =
  28. 28.21² =
  29. 29.27² =
  30. 30.21² =
  31. 31.19² =
  32. 32.21² =
  33. 33.25² =
  34. 34.17² =
  35. 35.19² =
  36. 36.25² =
  37. 37.25² =
  38. 38.14² =
  39. 39.18² =
  40. 40.14² =

Answer key

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

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