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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 299 · 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. 1.71² =
  2. 2.19² =
  3. 3.51² =
  4. 4.91² =
  5. 5.61² =
  6. 6.31² =
  7. 7.91² =
  8. 8.31² =
  9. 9.71² =
  10. 10.89² =
  11. 11.49² =
  12. 12.89² =
  13. 13.59² =
  14. 14.81² =
  15. 15.69² =
  16. 16.21² =
  17. 17.19² =
  18. 18.89² =
  19. 19.81² =
  20. 20.21² =
  21. 21.31² =
  22. 22.41² =
  23. 23.79² =
  24. 24.91² =
  25. 25.31² =
  26. 26.71² =
  27. 27.89² =
  28. 28.41² =
  29. 29.49² =
  30. 30.71² =
  31. 31.81² =
  32. 32.51² =
  33. 33.19² =
  34. 34.31² =
  35. 35.49² =
  36. 36.51² =
  37. 37.29² =
  38. 38.19² =
  39. 39.81² =
  40. 40.31² =

Answer key

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

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