← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 21 · 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. 1.27² =
  2. 2.28² =
  3. 3.12² =
  4. 4.19² =
  5. 5.26² =
  6. 6.13² =
  7. 7.11² =
  8. 8.15² =
  9. 9.18² =
  10. 10.22² =
  11. 11.25² =
  12. 12.16² =
  13. 13.14² =
  14. 14.21² =
  15. 15.24² =
  16. 16.23² =
  17. 17.29² =
  18. 18.12² =
  19. 19.16² =
  20. 20.19² =
  21. 21.17² =
  22. 22.21² =
  23. 23.22² =
  24. 24.13² =
  25. 25.15² =
  26. 26.11² =
  27. 27.16² =
  28. 28.23² =
  29. 29.24² =
  30. 30.11² =
  31. 31.28² =
  32. 32.17² =
  33. 33.27² =
  34. 34.19² =
  35. 35.11² =
  36. 36.23² =
  37. 37.13² =
  38. 38.16² =
  39. 39.21² =
  40. 40.29² =

Answer key

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

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