← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 280 · 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. 4.13² =
  5. 5.26² =
  6. 6.12² =
  7. 7.15² =
  8. 8.27² =
  9. 9.18² =
  10. 10.16² =
  11. 11.24² =
  12. 12.28² =
  13. 13.19² =
  14. 14.23² =
  15. 15.22² =
  16. 16.11² =
  17. 17.25² =
  18. 18.29² =
  19. 19.24² =
  20. 20.18² =
  21. 21.22² =
  22. 22.21² =
  23. 23.21² =
  24. 24.19² =
  25. 25.16² =
  26. 26.21² =
  27. 27.15² =
  28. 28.24² =
  29. 29.21² =
  30. 30.25² =
  31. 31.18² =
  32. 32.21² =
  33. 33.21² =
  34. 34.24² =
  35. 35.22² =
  36. 36.16² =
  37. 37.19² =
  38. 38.13² =
  39. 39.26² =
  40. 40.21² =

Answer key

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

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