← Squares up to 30 lesson New set →

Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 98 · 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. 1.19² =
  2. 2.13² =
  3. 3.21² =
  4. 4.14² =
  5. 5.25² =
  6. 6.11² =
  7. 7.29² =
  8. 8.15² =
  9. 9.27² =
  10. 10.17² =
  11. 11.22² =
  12. 12.26² =
  13. 13.16² =
  14. 14.28² =
  15. 15.28² =
  16. 16.24² =
  17. 17.18² =
  18. 18.12² =
  19. 19.25² =
  20. 20.19² =
  21. 21.23² =
  22. 22.28² =
  23. 23.21² =
  24. 24.24² =
  25. 25.21² =
  26. 26.23² =
  27. 27.28² =
  28. 28.13² =
  29. 29.27² =
  30. 30.29² =
  31. 31.25² =
  32. 32.15² =
  33. 33.29² =
  34. 34.29² =
  35. 35.14² =
  36. 36.11² =
  37. 37.13² =
  38. 38.16² =
  39. 39.24² =
  40. 40.14² =

Answer key

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

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