← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 310 · 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. 3.14² =
  4. 4.25² =
  5. 5.29² =
  6. 6.28² =
  7. 7.26² =
  8. 8.23² =
  9. 9.24² =
  10. 10.11² =
  11. 11.15² =
  12. 12.16² =
  13. 13.12² =
  14. 14.13² =
  15. 15.22² =
  16. 16.18² =
  17. 17.19² =
  18. 18.16² =
  19. 19.29² =
  20. 20.25² =
  21. 21.22² =
  22. 22.28² =
  23. 23.27² =
  24. 24.18² =
  25. 25.29² =
  26. 26.21² =
  27. 27.28² =
  28. 28.19² =
  29. 29.24² =
  30. 30.28² =
  31. 31.23² =
  32. 32.23² =
  33. 33.24² =
  34. 34.14² =
  35. 35.11² =
  36. 36.19² =
  37. 37.23² =
  38. 38.12² =
  39. 39.22² =
  40. 40.22² =

Answer key

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

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