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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 153 · 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. 2.49² =
  3. 3.59² =
  4. 4.61² =
  5. 5.61² =
  6. 6.79² =
  7. 7.19² =
  8. 8.71² =
  9. 9.59² =
  10. 10.89² =
  11. 11.49² =
  12. 12.41² =
  13. 13.31² =
  14. 14.91² =
  15. 15.69² =
  16. 16.51² =
  17. 17.59² =
  18. 18.21² =
  19. 19.51² =
  20. 20.69² =
  21. 21.41² =
  22. 22.21² =
  23. 23.21² =
  24. 24.89² =
  25. 25.59² =
  26. 26.81² =
  27. 27.51² =
  28. 28.39² =
  29. 29.89² =
  30. 30.31² =
  31. 31.31² =
  32. 32.31² =
  33. 33.39² =
  34. 34.51² =
  35. 35.19² =
  36. 36.71² =
  37. 37.29² =
  38. 38.19² =
  39. 39.59² =
  40. 40.29² =

Answer key

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

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