← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 943 · 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. 2.17² =
  3. 3.24² =
  4. 4.22² =
  5. 5.15² =
  6. 6.13² =
  7. 7.11² =
  8. 8.27² =
  9. 9.16² =
  10. 10.18² =
  11. 11.25² =
  12. 12.19² =
  13. 13.28² =
  14. 14.12² =
  15. 15.26² =
  16. 16.14² =
  17. 17.13² =
  18. 18.23² =
  19. 19.24² =
  20. 20.29² =
  21. 21.24² =
  22. 22.13² =
  23. 23.14² =
  24. 24.14² =
  25. 25.21² =
  26. 26.11² =
  27. 27.29² =
  28. 28.19² =
  29. 29.18² =
  30. 30.24² =
  31. 31.12² =
  32. 32.25² =
  33. 33.21² =
  34. 34.21² =
  35. 35.17² =
  36. 36.13² =
  37. 37.19² =
  38. 38.28² =
  39. 39.17² =
  40. 40.22² =

Answer key

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

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