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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 580 · 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. 1.29² =
  2. 2.79² =
  3. 3.29² =
  4. 4.81² =
  5. 5.41² =
  6. 6.49² =
  7. 7.19² =
  8. 8.91² =
  9. 9.29² =
  10. 10.59² =
  11. 11.71² =
  12. 12.19² =
  13. 13.61² =
  14. 14.31² =
  15. 15.49² =
  16. 16.29² =
  17. 17.71² =
  18. 18.71² =
  19. 19.51² =
  20. 20.29² =
  21. 21.71² =
  22. 22.19² =
  23. 23.29² =
  24. 24.79² =
  25. 25.21² =
  26. 26.71² =
  27. 27.19² =
  28. 28.79² =
  29. 29.71² =
  30. 30.89² =
  31. 31.61² =
  32. 32.89² =
  33. 33.89² =
  34. 34.31² =
  35. 35.89² =
  36. 36.49² =
  37. 37.31² =
  38. 38.59² =
  39. 39.41² =
  40. 40.81² =

Answer key

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

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