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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 509 · 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. 1.19² =
  2. 2.51² =
  3. 3.89² =
  4. 4.71² =
  5. 5.39² =
  6. 6.79² =
  7. 7.89² =
  8. 8.89² =
  9. 9.91² =
  10. 10.79² =
  11. 11.19² =
  12. 12.29² =
  13. 13.41² =
  14. 14.71² =
  15. 15.41² =
  16. 16.39² =
  17. 17.51² =
  18. 18.31² =
  19. 19.79² =
  20. 20.19² =
  21. 21.41² =
  22. 22.29² =
  23. 23.41² =
  24. 24.81² =
  25. 25.49² =
  26. 26.21² =
  27. 27.39² =
  28. 28.89² =
  29. 29.29² =
  30. 30.89² =
  31. 31.31² =
  32. 32.29² =
  33. 33.19² =
  34. 34.69² =
  35. 35.19² =
  36. 36.41² =
  37. 37.21² =
  38. 38.19² =
  39. 39.89² =
  40. 40.81² =

Answer key

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

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