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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 500 · 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. 3.29² =
  4. 4.31² =
  5. 5.89² =
  6. 6.39² =
  7. 7.31² =
  8. 8.31² =
  9. 9.81² =
  10. 10.89² =
  11. 11.79² =
  12. 12.19² =
  13. 13.49² =
  14. 14.21² =
  15. 15.69² =
  16. 16.19² =
  17. 17.91² =
  18. 18.19² =
  19. 19.19² =
  20. 20.89² =
  21. 21.49² =
  22. 22.31² =
  23. 23.21² =
  24. 24.49² =
  25. 25.71² =
  26. 26.41² =
  27. 27.69² =
  28. 28.71² =
  29. 29.91² =
  30. 30.41² =
  31. 31.31² =
  32. 32.41² =
  33. 33.31² =
  34. 34.39² =
  35. 35.59² =
  36. 36.71² =
  37. 37.31² =
  38. 38.61² =
  39. 39.21² =
  40. 40.89² =

Answer key

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

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