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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 617 · 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. 2.89² =
  3. 3.31² =
  4. 4.81² =
  5. 5.61² =
  6. 6.39² =
  7. 7.69² =
  8. 8.79² =
  9. 9.31² =
  10. 10.91² =
  11. 11.91² =
  12. 12.29² =
  13. 13.59² =
  14. 14.31² =
  15. 15.91² =
  16. 16.31² =
  17. 17.71² =
  18. 18.39² =
  19. 19.89² =
  20. 20.59² =
  21. 21.79² =
  22. 22.71² =
  23. 23.29² =
  24. 24.89² =
  25. 25.89² =
  26. 26.61² =
  27. 27.79² =
  28. 28.39² =
  29. 29.91² =
  30. 30.21² =
  31. 31.69² =
  32. 32.21² =
  33. 33.49² =
  34. 34.21² =
  35. 35.79² =
  36. 36.79² =
  37. 37.31² =
  38. 38.59² =
  39. 39.51² =
  40. 40.29² =

Answer key

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

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