← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 23 · 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. 2.18² =
  3. 3.12² =
  4. 4.24² =
  5. 5.19² =
  6. 6.27² =
  7. 7.26² =
  8. 8.14² =
  9. 9.25² =
  10. 10.22² =
  11. 11.28² =
  12. 12.11² =
  13. 13.29² =
  14. 14.21² =
  15. 15.16² =
  16. 16.15² =
  17. 17.23² =
  18. 18.28² =
  19. 19.17² =
  20. 20.29² =
  21. 21.11² =
  22. 22.14² =
  23. 23.23² =
  24. 24.21² =
  25. 25.25² =
  26. 26.19² =
  27. 27.23² =
  28. 28.26² =
  29. 29.11² =
  30. 30.11² =
  31. 31.28² =
  32. 32.12² =
  33. 33.23² =
  34. 34.24² =
  35. 35.18² =
  36. 36.24² =
  37. 37.11² =
  38. 38.22² =
  39. 39.16² =
  40. 40.28² =

Answer key

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

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