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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 313 · 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. 1.29² =
  2. 2.59² =
  3. 3.29² =
  4. 4.79² =
  5. 5.49² =
  6. 6.39² =
  7. 7.71² =
  8. 8.69² =
  9. 9.89² =
  10. 10.29² =
  11. 11.81² =
  12. 12.69² =
  13. 13.29² =
  14. 14.69² =
  15. 15.29² =
  16. 16.39² =
  17. 17.91² =
  18. 18.49² =
  19. 19.69² =
  20. 20.21² =
  21. 21.19² =
  22. 22.31² =
  23. 23.41² =
  24. 24.31² =
  25. 25.61² =
  26. 26.19² =
  27. 27.61² =
  28. 28.21² =
  29. 29.49² =
  30. 30.61² =
  31. 31.19² =
  32. 32.19² =
  33. 33.59² =
  34. 34.81² =
  35. 35.21² =
  36. 36.19² =
  37. 37.59² =
  38. 38.69² =
  39. 39.21² =
  40. 40.49² =

Answer key

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

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