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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 867 · 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. 2.49² =
  3. 3.19² =
  4. 4.81² =
  5. 5.89² =
  6. 6.21² =
  7. 7.39² =
  8. 8.81² =
  9. 9.59² =
  10. 10.19² =
  11. 11.71² =
  12. 12.21² =
  13. 13.81² =
  14. 14.79² =
  15. 15.39² =
  16. 16.19² =
  17. 17.19² =
  18. 18.61² =
  19. 19.69² =
  20. 20.89² =
  21. 21.69² =
  22. 22.81² =
  23. 23.31² =
  24. 24.89² =
  25. 25.51² =
  26. 26.51² =
  27. 27.89² =
  28. 28.29² =
  29. 29.49² =
  30. 30.69² =
  31. 31.59² =
  32. 32.39² =
  33. 33.19² =
  34. 34.91² =
  35. 35.21² =
  36. 36.49² =
  37. 37.71² =
  38. 38.59² =
  39. 39.29² =
  40. 40.49² =

Answer key

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

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