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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 81 · 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. 2.49² =
  3. 3.71² =
  4. 4.21² =
  5. 5.31² =
  6. 6.39² =
  7. 7.61² =
  8. 8.19² =
  9. 9.19² =
  10. 10.21² =
  11. 11.81² =
  12. 12.29² =
  13. 13.49² =
  14. 14.49² =
  15. 15.19² =
  16. 16.49² =
  17. 17.69² =
  18. 18.21² =
  19. 19.71² =
  20. 20.29² =
  21. 21.29² =
  22. 22.19² =
  23. 23.79² =
  24. 24.19² =
  25. 25.41² =
  26. 26.51² =
  27. 27.41² =
  28. 28.61² =
  29. 29.29² =
  30. 30.31² =
  31. 31.41² =
  32. 32.39² =
  33. 33.51² =
  34. 34.89² =
  35. 35.21² =
  36. 36.69² =
  37. 37.91² =
  38. 38.21² =
  39. 39.71² =
  40. 40.29² =

Answer key

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

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