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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 258 · 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. 2.51² =
  3. 3.51² =
  4. 4.21² =
  5. 5.81² =
  6. 6.69² =
  7. 7.91² =
  8. 8.59² =
  9. 9.61² =
  10. 10.31² =
  11. 11.29² =
  12. 12.41² =
  13. 13.29² =
  14. 14.31² =
  15. 15.61² =
  16. 16.21² =
  17. 17.59² =
  18. 18.21² =
  19. 19.71² =
  20. 20.81² =
  21. 21.29² =
  22. 22.21² =
  23. 23.31² =
  24. 24.49² =
  25. 25.89² =
  26. 26.61² =
  27. 27.59² =
  28. 28.31² =
  29. 29.29² =
  30. 30.19² =
  31. 31.29² =
  32. 32.79² =
  33. 33.69² =
  34. 34.69² =
  35. 35.31² =
  36. 36.89² =
  37. 37.49² =
  38. 38.19² =
  39. 39.51² =
  40. 40.91² =

Answer key

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

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