← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 148 · 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. 1.26² =
  2. 2.15² =
  3. 3.18² =
  4. 4.13² =
  5. 5.21² =
  6. 6.23² =
  7. 7.29² =
  8. 8.22² =
  9. 9.19² =
  10. 10.28² =
  11. 11.16² =
  12. 12.11² =
  13. 13.12² =
  14. 14.27² =
  15. 15.17² =
  16. 16.14² =
  17. 17.13² =
  18. 18.25² =
  19. 19.19² =
  20. 20.24² =
  21. 21.15² =
  22. 22.19² =
  23. 23.15² =
  24. 24.23² =
  25. 25.13² =
  26. 26.12² =
  27. 27.26² =
  28. 28.23² =
  29. 29.26² =
  30. 30.21² =
  31. 31.28² =
  32. 32.29² =
  33. 33.18² =
  34. 34.16² =
  35. 35.13² =
  36. 36.22² =
  37. 37.12² =
  38. 38.23² =
  39. 39.11² =
  40. 40.16² =

Answer key

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

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