← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 767 · 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. 2.23² =
  3. 3.12² =
  4. 4.17² =
  5. 5.27² =
  6. 6.25² =
  7. 7.13² =
  8. 8.29² =
  9. 9.26² =
  10. 10.16² =
  11. 11.15² =
  12. 12.14² =
  13. 13.19² =
  14. 14.24² =
  15. 15.28² =
  16. 16.11² =
  17. 17.22² =
  18. 18.18² =
  19. 19.18² =
  20. 20.17² =
  21. 21.22² =
  22. 22.16² =
  23. 23.27² =
  24. 24.25² =
  25. 25.16² =
  26. 26.24² =
  27. 27.11² =
  28. 28.14² =
  29. 29.15² =
  30. 30.11² =
  31. 31.23² =
  32. 32.24² =
  33. 33.14² =
  34. 34.15² =
  35. 35.21² =
  36. 36.28² =
  37. 37.11² =
  38. 38.24² =
  39. 39.24² =
  40. 40.29² =

Answer key

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

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