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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 40 · 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. 1.21² =
  2. 2.39² =
  3. 3.91² =
  4. 4.69² =
  5. 5.21² =
  6. 6.41² =
  7. 7.21² =
  8. 8.59² =
  9. 9.31² =
  10. 10.31² =
  11. 11.31² =
  12. 12.59² =
  13. 13.71² =
  14. 14.49² =
  15. 15.79² =
  16. 16.41² =
  17. 17.69² =
  18. 18.41² =
  19. 19.59² =
  20. 20.19² =
  21. 21.59² =
  22. 22.91² =
  23. 23.79² =
  24. 24.41² =
  25. 25.41² =
  26. 26.61² =
  27. 27.79² =
  28. 28.39² =
  29. 29.61² =
  30. 30.61² =
  31. 31.91² =
  32. 32.89² =
  33. 33.59² =
  34. 34.71² =
  35. 35.89² =
  36. 36.69² =
  37. 37.31² =
  38. 38.91² =
  39. 39.59² =
  40. 40.31² =

Answer key

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

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