← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 726 · 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. 1.13² =
  2. 2.25² =
  3. 3.21² =
  4. 4.11² =
  5. 5.22² =
  6. 6.24² =
  7. 7.15² =
  8. 8.19² =
  9. 9.12² =
  10. 10.18² =
  11. 11.29² =
  12. 12.23² =
  13. 13.14² =
  14. 14.16² =
  15. 15.26² =
  16. 16.17² =
  17. 17.21² =
  18. 18.12² =
  19. 19.27² =
  20. 20.28² =
  21. 21.12² =
  22. 22.13² =
  23. 23.12² =
  24. 24.21² =
  25. 25.21² =
  26. 26.27² =
  27. 27.11² =
  28. 28.27² =
  29. 29.23² =
  30. 30.11² =
  31. 31.15² =
  32. 32.15² =
  33. 33.29² =
  34. 34.29² =
  35. 35.24² =
  36. 36.12² =
  37. 37.16² =
  38. 38.23² =
  39. 39.16² =
  40. 40.27² =

Answer key

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

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