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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 268 · 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. 1.59² =
  2. 2.51² =
  3. 3.19² =
  4. 4.41² =
  5. 5.21² =
  6. 6.39² =
  7. 7.69² =
  8. 8.29² =
  9. 9.19² =
  10. 10.61² =
  11. 11.71² =
  12. 12.81² =
  13. 13.71² =
  14. 14.91² =
  15. 15.61² =
  16. 16.39² =
  17. 17.71² =
  18. 18.21² =
  19. 19.89² =
  20. 20.89² =
  21. 21.81² =
  22. 22.31² =
  23. 23.91² =
  24. 24.91² =
  25. 25.19² =
  26. 26.69² =
  27. 27.19² =
  28. 28.29² =
  29. 29.79² =
  30. 30.21² =
  31. 31.19² =
  32. 32.81² =
  33. 33.31² =
  34. 34.61² =
  35. 35.51² =
  36. 36.51² =
  37. 37.21² =
  38. 38.81² =
  39. 39.49² =
  40. 40.31² =

Answer key

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

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