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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 106 · 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. 1.51² =
  2. 2.91² =
  3. 3.69² =
  4. 4.91² =
  5. 5.31² =
  6. 6.41² =
  7. 7.19² =
  8. 8.21² =
  9. 9.79² =
  10. 10.21² =
  11. 11.71² =
  12. 12.41² =
  13. 13.21² =
  14. 14.41² =
  15. 15.39² =
  16. 16.51² =
  17. 17.89² =
  18. 18.39² =
  19. 19.91² =
  20. 20.29² =
  21. 21.49² =
  22. 22.29² =
  23. 23.69² =
  24. 24.51² =
  25. 25.89² =
  26. 26.81² =
  27. 27.29² =
  28. 28.79² =
  29. 29.19² =
  30. 30.29² =
  31. 31.59² =
  32. 32.69² =
  33. 33.49² =
  34. 34.31² =
  35. 35.91² =
  36. 36.71² =
  37. 37.39² =
  38. 38.89² =
  39. 39.51² =
  40. 40.29² =

Answer key

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

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