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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 799 · 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. 1.39² =
  2. 2.41² =
  3. 3.89² =
  4. 4.29² =
  5. 5.21² =
  6. 6.49² =
  7. 7.39² =
  8. 8.91² =
  9. 9.81² =
  10. 10.59² =
  11. 11.39² =
  12. 12.29² =
  13. 13.41² =
  14. 14.31² =
  15. 15.61² =
  16. 16.89² =
  17. 17.71² =
  18. 18.61² =
  19. 19.89² =
  20. 20.79² =
  21. 21.49² =
  22. 22.79² =
  23. 23.91² =
  24. 24.41² =
  25. 25.19² =
  26. 26.81² =
  27. 27.49² =
  28. 28.21² =
  29. 29.29² =
  30. 30.31² =
  31. 31.31² =
  32. 32.21² =
  33. 33.61² =
  34. 34.59² =
  35. 35.49² =
  36. 36.61² =
  37. 37.81² =
  38. 38.51² =
  39. 39.91² =
  40. 40.69² =

Answer key

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

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