← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 38 · 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. 2.21² =
  3. 3.11² =
  4. 4.23² =
  5. 5.13² =
  6. 6.15² =
  7. 7.19² =
  8. 8.18² =
  9. 9.16² =
  10. 10.17² =
  11. 11.22² =
  12. 12.26² =
  13. 13.29² =
  14. 14.24² =
  15. 15.23² =
  16. 16.25² =
  17. 17.28² =
  18. 18.27² =
  19. 19.14² =
  20. 20.26² =
  21. 21.11² =
  22. 22.21² =
  23. 23.27² =
  24. 24.13² =
  25. 25.22² =
  26. 26.16² =
  27. 27.13² =
  28. 28.16² =
  29. 29.18² =
  30. 30.17² =
  31. 31.27² =
  32. 32.21² =
  33. 33.17² =
  34. 34.29² =
  35. 35.24² =
  36. 36.19² =
  37. 37.23² =
  38. 38.22² =
  39. 39.28² =
  40. 40.18² =

Answer key

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

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