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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 774 · 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. 2.49² =
  3. 3.89² =
  4. 4.79² =
  5. 5.31² =
  6. 6.21² =
  7. 7.89² =
  8. 8.19² =
  9. 9.51² =
  10. 10.21² =
  11. 11.19² =
  12. 12.39² =
  13. 13.21² =
  14. 14.39² =
  15. 15.41² =
  16. 16.59² =
  17. 17.31² =
  18. 18.31² =
  19. 19.91² =
  20. 20.31² =
  21. 21.89² =
  22. 22.89² =
  23. 23.69² =
  24. 24.61² =
  25. 25.81² =
  26. 26.49² =
  27. 27.59² =
  28. 28.61² =
  29. 29.39² =
  30. 30.81² =
  31. 31.89² =
  32. 32.71² =
  33. 33.39² =
  34. 34.29² =
  35. 35.69² =
  36. 36.81² =
  37. 37.19² =
  38. 38.79² =
  39. 39.81² =
  40. 40.31² =

Answer key

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

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