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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 754 · 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. 1.51² =
  2. 2.61² =
  3. 3.19² =
  4. 4.29² =
  5. 5.49² =
  6. 6.49² =
  7. 7.89² =
  8. 8.59² =
  9. 9.91² =
  10. 10.91² =
  11. 11.51² =
  12. 12.91² =
  13. 13.29² =
  14. 14.71² =
  15. 15.39² =
  16. 16.91² =
  17. 17.31² =
  18. 18.51² =
  19. 19.19² =
  20. 20.19² =
  21. 21.31² =
  22. 22.19² =
  23. 23.29² =
  24. 24.41² =
  25. 25.19² =
  26. 26.91² =
  27. 27.31² =
  28. 28.89² =
  29. 29.91² =
  30. 30.89² =
  31. 31.21² =
  32. 32.91² =
  33. 33.51² =
  34. 34.51² =
  35. 35.29² =
  36. 36.79² =
  37. 37.81² =
  38. 38.21² =
  39. 39.29² =
  40. 40.29² =

Answer key

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

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