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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 860 · 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. 1.91² =
  2. 2.31² =
  3. 3.29² =
  4. 4.31² =
  5. 5.79² =
  6. 6.19² =
  7. 7.29² =
  8. 8.91² =
  9. 9.69² =
  10. 10.71² =
  11. 11.61² =
  12. 12.61² =
  13. 13.49² =
  14. 14.69² =
  15. 15.81² =
  16. 16.69² =
  17. 17.41² =
  18. 18.19² =
  19. 19.61² =
  20. 20.89² =
  21. 21.29² =
  22. 22.31² =
  23. 23.19² =
  24. 24.41² =
  25. 25.71² =
  26. 26.61² =
  27. 27.71² =
  28. 28.91² =
  29. 29.31² =
  30. 30.79² =
  31. 31.31² =
  32. 32.59² =
  33. 33.61² =
  34. 34.29² =
  35. 35.79² =
  36. 36.91² =
  37. 37.81² =
  38. 38.19² =
  39. 39.89² =
  40. 40.81² =

Answer key

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

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