← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 223 · 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. 1.12² =
  2. 2.24² =
  3. 3.25² =
  4. 4.29² =
  5. 5.21² =
  6. 6.28² =
  7. 7.26² =
  8. 8.18² =
  9. 9.17² =
  10. 10.14² =
  11. 11.16² =
  12. 12.22² =
  13. 13.13² =
  14. 14.19² =
  15. 15.11² =
  16. 16.23² =
  17. 17.16² =
  18. 18.27² =
  19. 19.15² =
  20. 20.21² =
  21. 21.21² =
  22. 22.26² =
  23. 23.12² =
  24. 24.25² =
  25. 25.13² =
  26. 26.21² =
  27. 27.29² =
  28. 28.16² =
  29. 29.15² =
  30. 30.17² =
  31. 31.25² =
  32. 32.28² =
  33. 33.27² =
  34. 34.28² =
  35. 35.24² =
  36. 36.23² =
  37. 37.21² =
  38. 38.17² =
  39. 39.13² =
  40. 40.27² =

Answer key

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

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