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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 755 · 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. 1.49² =
  2. 2.21² =
  3. 3.39² =
  4. 4.29² =
  5. 5.71² =
  6. 6.41² =
  7. 7.61² =
  8. 8.91² =
  9. 9.29² =
  10. 10.79² =
  11. 11.59² =
  12. 12.81² =
  13. 13.89² =
  14. 14.79² =
  15. 15.31² =
  16. 16.41² =
  17. 17.71² =
  18. 18.91² =
  19. 19.71² =
  20. 20.39² =
  21. 21.21² =
  22. 22.91² =
  23. 23.71² =
  24. 24.41² =
  25. 25.89² =
  26. 26.49² =
  27. 27.41² =
  28. 28.21² =
  29. 29.19² =
  30. 30.81² =
  31. 31.41² =
  32. 32.59² =
  33. 33.31² =
  34. 34.91² =
  35. 35.21² =
  36. 36.49² =
  37. 37.19² =
  38. 38.31² =
  39. 39.81² =
  40. 40.41² =

Answer key

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

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