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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 481 · 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. 1.81² =
  2. 2.51² =
  3. 3.31² =
  4. 4.89² =
  5. 5.89² =
  6. 6.59² =
  7. 7.91² =
  8. 8.49² =
  9. 9.31² =
  10. 10.41² =
  11. 11.79² =
  12. 12.49² =
  13. 13.31² =
  14. 14.29² =
  15. 15.31² =
  16. 16.21² =
  17. 17.69² =
  18. 18.69² =
  19. 19.71² =
  20. 20.71² =
  21. 21.41² =
  22. 22.29² =
  23. 23.19² =
  24. 24.89² =
  25. 25.51² =
  26. 26.69² =
  27. 27.81² =
  28. 28.51² =
  29. 29.31² =
  30. 30.39² =
  31. 31.31² =
  32. 32.39² =
  33. 33.19² =
  34. 34.21² =
  35. 35.81² =
  36. 36.89² =
  37. 37.19² =
  38. 38.81² =
  39. 39.89² =
  40. 40.79² =

Answer key

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

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