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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 195 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.19² =
  2. 2.89² =
  3. 3.51² =
  4. 4.59² =
  5. 5.51² =
  6. 6.89² =
  7. 7.59² =
  8. 8.21² =
  9. 9.71² =
  10. 10.51² =
  11. 11.29² =
  12. 12.31² =
  13. 13.51² =
  14. 14.59² =
  15. 15.39² =
  16. 16.41² =
  17. 17.89² =
  18. 18.91² =
  19. 19.19² =
  20. 20.49² =
  21. 21.31² =
  22. 22.49² =
  23. 23.41² =
  24. 24.59² =
  25. 25.59² =
  26. 26.39² =
  27. 27.29² =
  28. 28.41² =
  29. 29.89² =
  30. 30.21² =
  31. 31.31² =
  32. 32.81² =
  33. 33.19² =
  34. 34.49² =
  35. 35.29² =
  36. 36.39² =
  37. 37.79² =
  38. 38.49² =
  39. 39.29² =
  40. 40.19² =

Answer key

  1. 361
  2. 7921
  3. 2601
  4. 3481
  5. 2601
  6. 7921
  7. 3481
  8. 441
  9. 5041
  10. 2601
  11. 841
  12. 961
  13. 2601
  14. 3481
  15. 1521
  16. 1681
  17. 7921
  18. 8281
  19. 361
  20. 2401
  21. 961
  22. 2401
  23. 1681
  24. 3481
  25. 3481
  26. 1521
  27. 841
  28. 1681
  29. 7921
  30. 441
  31. 961
  32. 6561
  33. 361
  34. 2401
  35. 841
  36. 1521
  37. 6241
  38. 2401
  39. 841
  40. 361

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