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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 220 · 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. 1.89² =
  2. 2.71² =
  3. 3.51² =
  4. 4.29² =
  5. 5.19² =
  6. 6.59² =
  7. 7.81² =
  8. 8.61² =
  9. 9.61² =
  10. 10.41² =
  11. 11.81² =
  12. 12.91² =
  13. 13.41² =
  14. 14.69² =
  15. 15.41² =
  16. 16.69² =
  17. 17.51² =
  18. 18.49² =
  19. 19.61² =
  20. 20.49² =
  21. 21.71² =
  22. 22.89² =
  23. 23.79² =
  24. 24.41² =
  25. 25.59² =
  26. 26.89² =
  27. 27.91² =
  28. 28.31² =
  29. 29.19² =
  30. 30.31² =
  31. 31.51² =
  32. 32.41² =
  33. 33.21² =
  34. 34.39² =
  35. 35.39² =
  36. 36.39² =
  37. 37.19² =
  38. 38.21² =
  39. 39.21² =
  40. 40.49² =

Answer key

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

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