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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 650 · 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. 1.31² =
  2. 2.29² =
  3. 3.91² =
  4. 4.59² =
  5. 5.59² =
  6. 6.89² =
  7. 7.39² =
  8. 8.81² =
  9. 9.29² =
  10. 10.69² =
  11. 11.49² =
  12. 12.89² =
  13. 13.61² =
  14. 14.21² =
  15. 15.21² =
  16. 16.31² =
  17. 17.79² =
  18. 18.39² =
  19. 19.31² =
  20. 20.51² =
  21. 21.69² =
  22. 22.69² =
  23. 23.31² =
  24. 24.41² =
  25. 25.39² =
  26. 26.19² =
  27. 27.41² =
  28. 28.39² =
  29. 29.39² =
  30. 30.81² =
  31. 31.89² =
  32. 32.79² =
  33. 33.71² =
  34. 34.21² =
  35. 35.91² =
  36. 36.51² =
  37. 37.81² =
  38. 38.59² =
  39. 39.39² =
  40. 40.29² =

Answer key

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

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