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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 690 · 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. 1.41² =
  2. 2.31² =
  3. 3.21² =
  4. 4.39² =
  5. 5.59² =
  6. 6.21² =
  7. 7.81² =
  8. 8.91² =
  9. 9.19² =
  10. 10.91² =
  11. 11.71² =
  12. 12.69² =
  13. 13.21² =
  14. 14.21² =
  15. 15.71² =
  16. 16.19² =
  17. 17.31² =
  18. 18.61² =
  19. 19.61² =
  20. 20.71² =
  21. 21.19² =
  22. 22.71² =
  23. 23.79² =
  24. 24.59² =
  25. 25.89² =
  26. 26.19² =
  27. 27.41² =
  28. 28.49² =
  29. 29.69² =
  30. 30.69² =
  31. 31.89² =
  32. 32.71² =
  33. 33.49² =
  34. 34.41² =
  35. 35.39² =
  36. 36.39² =
  37. 37.49² =
  38. 38.79² =
  39. 39.19² =
  40. 40.41² =

Answer key

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

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