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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 210 · 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. 1.41² =
  2. 2.81² =
  3. 3.29² =
  4. 4.19² =
  5. 5.21² =
  6. 6.89² =
  7. 7.41² =
  8. 8.89² =
  9. 9.39² =
  10. 10.71² =
  11. 11.31² =
  12. 12.31² =
  13. 13.71² =
  14. 14.41² =
  15. 15.81² =
  16. 16.89² =
  17. 17.61² =
  18. 18.31² =
  19. 19.21² =
  20. 20.79² =
  21. 21.91² =
  22. 22.59² =
  23. 23.81² =
  24. 24.49² =
  25. 25.21² =
  26. 26.29² =
  27. 27.61² =
  28. 28.61² =
  29. 29.79² =
  30. 30.59² =
  31. 31.89² =
  32. 32.21² =
  33. 33.21² =
  34. 34.81² =
  35. 35.41² =
  36. 36.41² =
  37. 37.41² =
  38. 38.69² =
  39. 39.59² =
  40. 40.19² =

Answer key

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

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