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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 360 · 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. 2.71² =
  3. 3.39² =
  4. 4.69² =
  5. 5.19² =
  6. 6.59² =
  7. 7.29² =
  8. 8.59² =
  9. 9.31² =
  10. 10.81² =
  11. 11.71² =
  12. 12.79² =
  13. 13.19² =
  14. 14.91² =
  15. 15.61² =
  16. 16.71² =
  17. 17.49² =
  18. 18.21² =
  19. 19.81² =
  20. 20.21² =
  21. 21.81² =
  22. 22.89² =
  23. 23.29² =
  24. 24.31² =
  25. 25.59² =
  26. 26.81² =
  27. 27.89² =
  28. 28.61² =
  29. 29.19² =
  30. 30.19² =
  31. 31.19² =
  32. 32.91² =
  33. 33.61² =
  34. 34.71² =
  35. 35.31² =
  36. 36.91² =
  37. 37.49² =
  38. 38.41² =
  39. 39.89² =
  40. 40.29² =

Answer key

  1. 841
  2. 5041
  3. 1521
  4. 4761
  5. 361
  6. 3481
  7. 841
  8. 3481
  9. 961
  10. 6561
  11. 5041
  12. 6241
  13. 361
  14. 8281
  15. 3721
  16. 5041
  17. 2401
  18. 441
  19. 6561
  20. 441
  21. 6561
  22. 7921
  23. 841
  24. 961
  25. 3481
  26. 6561
  27. 7921
  28. 3721
  29. 361
  30. 361
  31. 361
  32. 8281
  33. 3721
  34. 5041
  35. 961
  36. 8281
  37. 2401
  38. 1681
  39. 7921
  40. 841

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