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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 459 · 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. 1.59² =
  2. 2.39² =
  3. 3.29² =
  4. 4.89² =
  5. 5.59² =
  6. 6.41² =
  7. 7.21² =
  8. 8.79² =
  9. 9.89² =
  10. 10.69² =
  11. 11.19² =
  12. 12.81² =
  13. 13.69² =
  14. 14.89² =
  15. 15.21² =
  16. 16.41² =
  17. 17.29² =
  18. 18.69² =
  19. 19.89² =
  20. 20.21² =
  21. 21.39² =
  22. 22.91² =
  23. 23.39² =
  24. 24.81² =
  25. 25.39² =
  26. 26.79² =
  27. 27.49² =
  28. 28.89² =
  29. 29.39² =
  30. 30.21² =
  31. 31.59² =
  32. 32.89² =
  33. 33.89² =
  34. 34.51² =
  35. 35.39² =
  36. 36.81² =
  37. 37.29² =
  38. 38.61² =
  39. 39.51² =
  40. 40.31² =

Answer key

  1. 3481
  2. 1521
  3. 841
  4. 7921
  5. 3481
  6. 1681
  7. 441
  8. 6241
  9. 7921
  10. 4761
  11. 361
  12. 6561
  13. 4761
  14. 7921
  15. 441
  16. 1681
  17. 841
  18. 4761
  19. 7921
  20. 441
  21. 1521
  22. 8281
  23. 1521
  24. 6561
  25. 1521
  26. 6241
  27. 2401
  28. 7921
  29. 1521
  30. 441
  31. 3481
  32. 7921
  33. 7921
  34. 2601
  35. 1521
  36. 6561
  37. 841
  38. 3721
  39. 2601
  40. 961

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