← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 855 · 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. 1.28² =
  2. 2.27² =
  3. 3.12² =
  4. 4.17² =
  5. 5.24² =
  6. 6.14² =
  7. 7.11² =
  8. 8.13² =
  9. 9.23² =
  10. 10.25² =
  11. 11.19² =
  12. 12.18² =
  13. 13.15² =
  14. 14.26² =
  15. 15.21² =
  16. 16.29² =
  17. 17.22² =
  18. 18.26² =
  19. 19.26² =
  20. 20.16² =
  21. 21.17² =
  22. 22.21² =
  23. 23.18² =
  24. 24.28² =
  25. 25.19² =
  26. 26.27² =
  27. 27.18² =
  28. 28.18² =
  29. 29.14² =
  30. 30.11² =
  31. 31.26² =
  32. 32.23² =
  33. 33.17² =
  34. 34.19² =
  35. 35.22² =
  36. 36.29² =
  37. 37.14² =
  38. 38.16² =
  39. 39.19² =
  40. 40.25² =

Answer key

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

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