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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 834 · 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. 1.89² =
  2. 2.81² =
  3. 3.19² =
  4. 4.39² =
  5. 5.59² =
  6. 6.91² =
  7. 7.89² =
  8. 8.19² =
  9. 9.49² =
  10. 10.71² =
  11. 11.81² =
  12. 12.29² =
  13. 13.19² =
  14. 14.81² =
  15. 15.69² =
  16. 16.31² =
  17. 17.61² =
  18. 18.41² =
  19. 19.21² =
  20. 20.61² =
  21. 21.61² =
  22. 22.49² =
  23. 23.29² =
  24. 24.39² =
  25. 25.21² =
  26. 26.41² =
  27. 27.69² =
  28. 28.19² =
  29. 29.79² =
  30. 30.29² =
  31. 31.89² =
  32. 32.69² =
  33. 33.31² =
  34. 34.19² =
  35. 35.31² =
  36. 36.79² =
  37. 37.69² =
  38. 38.51² =
  39. 39.39² =
  40. 40.39² =

Answer key

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

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