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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 559 · 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. 1.61² =
  2. 2.51² =
  3. 3.51² =
  4. 4.21² =
  5. 5.81² =
  6. 6.69² =
  7. 7.59² =
  8. 8.91² =
  9. 9.71² =
  10. 10.29² =
  11. 11.59² =
  12. 12.51² =
  13. 13.61² =
  14. 14.29² =
  15. 15.61² =
  16. 16.39² =
  17. 17.21² =
  18. 18.89² =
  19. 19.51² =
  20. 20.19² =
  21. 21.91² =
  22. 22.31² =
  23. 23.69² =
  24. 24.61² =
  25. 25.31² =
  26. 26.91² =
  27. 27.89² =
  28. 28.31² =
  29. 29.39² =
  30. 30.19² =
  31. 31.19² =
  32. 32.39² =
  33. 33.19² =
  34. 34.91² =
  35. 35.89² =
  36. 36.51² =
  37. 37.81² =
  38. 38.89² =
  39. 39.41² =
  40. 40.79² =

Answer key

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

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