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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 266 · 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. 1.29² =
  2. 2.41² =
  3. 3.71² =
  4. 4.69² =
  5. 5.81² =
  6. 6.31² =
  7. 7.31² =
  8. 8.79² =
  9. 9.49² =
  10. 10.39² =
  11. 11.19² =
  12. 12.69² =
  13. 13.91² =
  14. 14.61² =
  15. 15.51² =
  16. 16.21² =
  17. 17.91² =
  18. 18.61² =
  19. 19.69² =
  20. 20.41² =
  21. 21.91² =
  22. 22.41² =
  23. 23.79² =
  24. 24.21² =
  25. 25.59² =
  26. 26.29² =
  27. 27.31² =
  28. 28.61² =
  29. 29.49² =
  30. 30.41² =
  31. 31.91² =
  32. 32.71² =
  33. 33.29² =
  34. 34.31² =
  35. 35.89² =
  36. 36.71² =
  37. 37.71² =
  38. 38.21² =
  39. 39.41² =
  40. 40.29² =

Answer key

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

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