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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 767 · 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. 1.49² =
  2. 2.39² =
  3. 3.91² =
  4. 4.39² =
  5. 5.51² =
  6. 6.31² =
  7. 7.31² =
  8. 8.41² =
  9. 9.19² =
  10. 10.59² =
  11. 11.51² =
  12. 12.81² =
  13. 13.21² =
  14. 14.69² =
  15. 15.19² =
  16. 16.41² =
  17. 17.61² =
  18. 18.79² =
  19. 19.21² =
  20. 20.91² =
  21. 21.41² =
  22. 22.81² =
  23. 23.21² =
  24. 24.39² =
  25. 25.59² =
  26. 26.19² =
  27. 27.51² =
  28. 28.39² =
  29. 29.89² =
  30. 30.19² =
  31. 31.31² =
  32. 32.29² =
  33. 33.81² =
  34. 34.41² =
  35. 35.41² =
  36. 36.19² =
  37. 37.71² =
  38. 38.71² =
  39. 39.89² =
  40. 40.91² =

Answer key

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

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