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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 769 · 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. 1.49² =
  2. 2.71² =
  3. 3.81² =
  4. 4.89² =
  5. 5.19² =
  6. 6.79² =
  7. 7.41² =
  8. 8.79² =
  9. 9.29² =
  10. 10.81² =
  11. 11.79² =
  12. 12.59² =
  13. 13.89² =
  14. 14.89² =
  15. 15.41² =
  16. 16.19² =
  17. 17.19² =
  18. 18.29² =
  19. 19.31² =
  20. 20.21² =
  21. 21.19² =
  22. 22.31² =
  23. 23.91² =
  24. 24.89² =
  25. 25.31² =
  26. 26.39² =
  27. 27.49² =
  28. 28.61² =
  29. 29.19² =
  30. 30.41² =
  31. 31.29² =
  32. 32.41² =
  33. 33.51² =
  34. 34.89² =
  35. 35.91² =
  36. 36.49² =
  37. 37.49² =
  38. 38.71² =
  39. 39.29² =
  40. 40.29² =

Answer key

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

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