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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 117 · 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. 2.81² =
  3. 3.31² =
  4. 4.31² =
  5. 5.89² =
  6. 6.89² =
  7. 7.69² =
  8. 8.39² =
  9. 9.91² =
  10. 10.91² =
  11. 11.29² =
  12. 12.69² =
  13. 13.61² =
  14. 14.79² =
  15. 15.49² =
  16. 16.49² =
  17. 17.71² =
  18. 18.51² =
  19. 19.41² =
  20. 20.41² =
  21. 21.89² =
  22. 22.29² =
  23. 23.29² =
  24. 24.89² =
  25. 25.79² =
  26. 26.29² =
  27. 27.51² =
  28. 28.19² =
  29. 29.19² =
  30. 30.39² =
  31. 31.21² =
  32. 32.41² =
  33. 33.21² =
  34. 34.69² =
  35. 35.21² =
  36. 36.51² =
  37. 37.21² =
  38. 38.69² =
  39. 39.31² =
  40. 40.81² =

Answer key

  1. 3481
  2. 6561
  3. 961
  4. 961
  5. 7921
  6. 7921
  7. 4761
  8. 1521
  9. 8281
  10. 8281
  11. 841
  12. 4761
  13. 3721
  14. 6241
  15. 2401
  16. 2401
  17. 5041
  18. 2601
  19. 1681
  20. 1681
  21. 7921
  22. 841
  23. 841
  24. 7921
  25. 6241
  26. 841
  27. 2601
  28. 361
  29. 361
  30. 1521
  31. 441
  32. 1681
  33. 441
  34. 4761
  35. 441
  36. 2601
  37. 441
  38. 4761
  39. 961
  40. 6561

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