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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 844 · 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. 2.69² =
  3. 3.19² =
  4. 4.89² =
  5. 5.29² =
  6. 6.29² =
  7. 7.19² =
  8. 8.91² =
  9. 9.79² =
  10. 10.19² =
  11. 11.79² =
  12. 12.59² =
  13. 13.29² =
  14. 14.29² =
  15. 15.31² =
  16. 16.29² =
  17. 17.81² =
  18. 18.71² =
  19. 19.79² =
  20. 20.31² =
  21. 21.21² =
  22. 22.69² =
  23. 23.41² =
  24. 24.39² =
  25. 25.81² =
  26. 26.31² =
  27. 27.91² =
  28. 28.91² =
  29. 29.19² =
  30. 30.39² =
  31. 31.69² =
  32. 32.61² =
  33. 33.59² =
  34. 34.19² =
  35. 35.21² =
  36. 36.81² =
  37. 37.19² =
  38. 38.31² =
  39. 39.19² =
  40. 40.19² =

Answer key

  1. 8281
  2. 4761
  3. 361
  4. 7921
  5. 841
  6. 841
  7. 361
  8. 8281
  9. 6241
  10. 361
  11. 6241
  12. 3481
  13. 841
  14. 841
  15. 961
  16. 841
  17. 6561
  18. 5041
  19. 6241
  20. 961
  21. 441
  22. 4761
  23. 1681
  24. 1521
  25. 6561
  26. 961
  27. 8281
  28. 8281
  29. 361
  30. 1521
  31. 4761
  32. 3721
  33. 3481
  34. 361
  35. 441
  36. 6561
  37. 361
  38. 961
  39. 361
  40. 361

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