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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 37 · 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. 1.41² =
  2. 2.91² =
  3. 3.81² =
  4. 4.61² =
  5. 5.71² =
  6. 6.61² =
  7. 7.29² =
  8. 8.29² =
  9. 9.29² =
  10. 10.79² =
  11. 11.59² =
  12. 12.31² =
  13. 13.51² =
  14. 14.79² =
  15. 15.91² =
  16. 16.39² =
  17. 17.51² =
  18. 18.49² =
  19. 19.21² =
  20. 20.21² =
  21. 21.31² =
  22. 22.19² =
  23. 23.81² =
  24. 24.21² =
  25. 25.19² =
  26. 26.29² =
  27. 27.29² =
  28. 28.41² =
  29. 29.79² =
  30. 30.49² =
  31. 31.59² =
  32. 32.39² =
  33. 33.91² =
  34. 34.29² =
  35. 35.91² =
  36. 36.61² =
  37. 37.51² =
  38. 38.29² =
  39. 39.89² =
  40. 40.29² =

Answer key

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

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