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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 773 · 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. 1.59² =
  2. 2.59² =
  3. 3.91² =
  4. 4.61² =
  5. 5.19² =
  6. 6.29² =
  7. 7.21² =
  8. 8.71² =
  9. 9.61² =
  10. 10.49² =
  11. 11.29² =
  12. 12.59² =
  13. 13.69² =
  14. 14.29² =
  15. 15.29² =
  16. 16.39² =
  17. 17.89² =
  18. 18.19² =
  19. 19.19² =
  20. 20.51² =
  21. 21.21² =
  22. 22.31² =
  23. 23.31² =
  24. 24.61² =
  25. 25.19² =
  26. 26.51² =
  27. 27.91² =
  28. 28.81² =
  29. 29.41² =
  30. 30.29² =
  31. 31.71² =
  32. 32.89² =
  33. 33.39² =
  34. 34.21² =
  35. 35.69² =
  36. 36.19² =
  37. 37.41² =
  38. 38.89² =
  39. 39.41² =
  40. 40.79² =

Answer key

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

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