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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 845 · 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. 1.81² =
  2. 2.71² =
  3. 3.51² =
  4. 4.71² =
  5. 5.91² =
  6. 6.59² =
  7. 7.21² =
  8. 8.69² =
  9. 9.81² =
  10. 10.49² =
  11. 11.81² =
  12. 12.49² =
  13. 13.89² =
  14. 14.79² =
  15. 15.81² =
  16. 16.89² =
  17. 17.51² =
  18. 18.21² =
  19. 19.61² =
  20. 20.39² =
  21. 21.69² =
  22. 22.89² =
  23. 23.31² =
  24. 24.29² =
  25. 25.61² =
  26. 26.19² =
  27. 27.49² =
  28. 28.39² =
  29. 29.21² =
  30. 30.29² =
  31. 31.79² =
  32. 32.49² =
  33. 33.21² =
  34. 34.41² =
  35. 35.71² =
  36. 36.19² =
  37. 37.69² =
  38. 38.91² =
  39. 39.81² =
  40. 40.49² =

Answer key

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

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