← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 170 · 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. 2.12² =
  3. 3.18² =
  4. 4.27² =
  5. 5.14² =
  6. 6.29² =
  7. 7.26² =
  8. 8.25² =
  9. 9.19² =
  10. 10.13² =
  11. 11.24² =
  12. 12.16² =
  13. 13.28² =
  14. 14.23² =
  15. 15.22² =
  16. 16.11² =
  17. 17.15² =
  18. 18.12² =
  19. 19.17² =
  20. 20.24² =
  21. 21.29² =
  22. 22.18² =
  23. 23.29² =
  24. 24.11² =
  25. 25.29² =
  26. 26.21² =
  27. 27.28² =
  28. 28.26² =
  29. 29.28² =
  30. 30.16² =
  31. 31.28² =
  32. 32.29² =
  33. 33.11² =
  34. 34.29² =
  35. 35.26² =
  36. 36.21² =
  37. 37.24² =
  38. 38.24² =
  39. 39.15² =
  40. 40.29² =

Answer key

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

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