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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 450 · 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. 1.69² =
  2. 2.59² =
  3. 3.21² =
  4. 4.31² =
  5. 5.19² =
  6. 6.61² =
  7. 7.19² =
  8. 8.89² =
  9. 9.41² =
  10. 10.61² =
  11. 11.19² =
  12. 12.29² =
  13. 13.19² =
  14. 14.89² =
  15. 15.21² =
  16. 16.69² =
  17. 17.21² =
  18. 18.19² =
  19. 19.39² =
  20. 20.21² =
  21. 21.41² =
  22. 22.89² =
  23. 23.29² =
  24. 24.91² =
  25. 25.81² =
  26. 26.19² =
  27. 27.81² =
  28. 28.61² =
  29. 29.79² =
  30. 30.21² =
  31. 31.31² =
  32. 32.19² =
  33. 33.21² =
  34. 34.91² =
  35. 35.71² =
  36. 36.59² =
  37. 37.49² =
  38. 38.29² =
  39. 39.19² =
  40. 40.49² =

Answer key

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

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