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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 69 · 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. 1.39² =
  2. 2.71² =
  3. 3.21² =
  4. 4.69² =
  5. 5.59² =
  6. 6.89² =
  7. 7.89² =
  8. 8.41² =
  9. 9.89² =
  10. 10.31² =
  11. 11.79² =
  12. 12.49² =
  13. 13.31² =
  14. 14.49² =
  15. 15.29² =
  16. 16.29² =
  17. 17.49² =
  18. 18.89² =
  19. 19.51² =
  20. 20.39² =
  21. 21.89² =
  22. 22.69² =
  23. 23.19² =
  24. 24.31² =
  25. 25.39² =
  26. 26.81² =
  27. 27.89² =
  28. 28.89² =
  29. 29.31² =
  30. 30.29² =
  31. 31.81² =
  32. 32.39² =
  33. 33.29² =
  34. 34.19² =
  35. 35.79² =
  36. 36.79² =
  37. 37.71² =
  38. 38.21² =
  39. 39.81² =
  40. 40.59² =

Answer key

  1. 1521
  2. 5041
  3. 441
  4. 4761
  5. 3481
  6. 7921
  7. 7921
  8. 1681
  9. 7921
  10. 961
  11. 6241
  12. 2401
  13. 961
  14. 2401
  15. 841
  16. 841
  17. 2401
  18. 7921
  19. 2601
  20. 1521
  21. 7921
  22. 4761
  23. 361
  24. 961
  25. 1521
  26. 6561
  27. 7921
  28. 7921
  29. 961
  30. 841
  31. 6561
  32. 1521
  33. 841
  34. 361
  35. 6241
  36. 6241
  37. 5041
  38. 441
  39. 6561
  40. 3481

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