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Squares 1 to 30 Mental Maths Worksheet

Mental maths lesson 18: Squares up to 30 · Set 399 · 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. 1.25² =
  2. 2.13² =
  3. 3.14² =
  4. 4.27² =
  5. 5.21² =
  6. 6.16² =
  7. 7.15² =
  8. 8.26² =
  9. 9.18² =
  10. 10.11² =
  11. 11.12² =
  12. 12.17² =
  13. 13.24² =
  14. 14.23² =
  15. 15.28² =
  16. 16.29² =
  17. 17.22² =
  18. 18.29² =
  19. 19.19² =
  20. 20.26² =
  21. 21.11² =
  22. 22.16² =
  23. 23.21² =
  24. 24.25² =
  25. 25.19² =
  26. 26.12² =
  27. 27.25² =
  28. 28.19² =
  29. 29.22² =
  30. 30.28² =
  31. 31.13² =
  32. 32.18² =
  33. 33.23² =
  34. 34.12² =
  35. 35.23² =
  36. 36.21² =
  37. 37.21² =
  38. 38.19² =
  39. 39.29² =
  40. 40.13² =

Answer key

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

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