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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 720 · 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. 1.39² =
  2. 2.29² =
  3. 3.21² =
  4. 4.49² =
  5. 5.89² =
  6. 6.31² =
  7. 7.29² =
  8. 8.31² =
  9. 9.49² =
  10. 10.29² =
  11. 11.69² =
  12. 12.51² =
  13. 13.89² =
  14. 14.39² =
  15. 15.51² =
  16. 16.81² =
  17. 17.69² =
  18. 18.91² =
  19. 19.71² =
  20. 20.59² =
  21. 21.69² =
  22. 22.39² =
  23. 23.81² =
  24. 24.31² =
  25. 25.39² =
  26. 26.29² =
  27. 27.89² =
  28. 28.61² =
  29. 29.61² =
  30. 30.31² =
  31. 31.29² =
  32. 32.59² =
  33. 33.19² =
  34. 34.79² =
  35. 35.19² =
  36. 36.31² =
  37. 37.71² =
  38. 38.79² =
  39. 39.41² =
  40. 40.61² =

Answer key

  1. 1521
  2. 841
  3. 441
  4. 2401
  5. 7921
  6. 961
  7. 841
  8. 961
  9. 2401
  10. 841
  11. 4761
  12. 2601
  13. 7921
  14. 1521
  15. 2601
  16. 6561
  17. 4761
  18. 8281
  19. 5041
  20. 3481
  21. 4761
  22. 1521
  23. 6561
  24. 961
  25. 1521
  26. 841
  27. 7921
  28. 3721
  29. 3721
  30. 961
  31. 841
  32. 3481
  33. 361
  34. 6241
  35. 361
  36. 961
  37. 5041
  38. 6241
  39. 1681
  40. 3721

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