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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 390 · 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. 1.29² =
  2. 2.11² =
  3. 3.21² =
  4. 4.27² =
  5. 5.25² =
  6. 6.26² =
  7. 7.24² =
  8. 8.19² =
  9. 9.16² =
  10. 10.13² =
  11. 11.17² =
  12. 12.14² =
  13. 13.12² =
  14. 14.15² =
  15. 15.18² =
  16. 16.25² =
  17. 17.23² =
  18. 18.14² =
  19. 19.12² =
  20. 20.28² =
  21. 21.12² =
  22. 22.25² =
  23. 23.22² =
  24. 24.12² =
  25. 25.22² =
  26. 26.16² =
  27. 27.19² =
  28. 28.24² =
  29. 29.14² =
  30. 30.22² =
  31. 31.21² =
  32. 32.28² =
  33. 33.21² =
  34. 34.26² =
  35. 35.11² =
  36. 36.27² =
  37. 37.11² =
  38. 38.21² =
  39. 39.14² =
  40. 40.21² =

Answer key

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

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