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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 621 · 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. 1.69² =
  2. 2.91² =
  3. 3.21² =
  4. 4.51² =
  5. 5.41² =
  6. 6.39² =
  7. 7.89² =
  8. 8.31² =
  9. 9.39² =
  10. 10.81² =
  11. 11.29² =
  12. 12.89² =
  13. 13.89² =
  14. 14.29² =
  15. 15.81² =
  16. 16.71² =
  17. 17.41² =
  18. 18.71² =
  19. 19.21² =
  20. 20.71² =
  21. 21.41² =
  22. 22.89² =
  23. 23.29² =
  24. 24.59² =
  25. 25.51² =
  26. 26.19² =
  27. 27.51² =
  28. 28.69² =
  29. 29.51² =
  30. 30.31² =
  31. 31.69² =
  32. 32.59² =
  33. 33.49² =
  34. 34.41² =
  35. 35.39² =
  36. 36.59² =
  37. 37.71² =
  38. 38.79² =
  39. 39.81² =
  40. 40.51² =

Answer key

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

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