← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 445 · 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. 2.26² =
  3. 3.17² =
  4. 4.28² =
  5. 5.12² =
  6. 6.25² =
  7. 7.19² =
  8. 8.27² =
  9. 9.13² =
  10. 10.11² =
  11. 11.15² =
  12. 12.18² =
  13. 13.22² =
  14. 14.24² =
  15. 15.14² =
  16. 16.23² =
  17. 17.16² =
  18. 18.18² =
  19. 19.29² =
  20. 20.29² =
  21. 21.17² =
  22. 22.11² =
  23. 23.21² =
  24. 24.21² =
  25. 25.14² =
  26. 26.24² =
  27. 27.13² =
  28. 28.22² =
  29. 29.14² =
  30. 30.11² =
  31. 31.18² =
  32. 32.11² =
  33. 33.12² =
  34. 34.14² =
  35. 35.28² =
  36. 36.21² =
  37. 37.21² =
  38. 38.29² =
  39. 39.16² =
  40. 40.19² =

Answer key

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

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