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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 633 · 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. 1.71² =
  2. 2.19² =
  3. 3.31² =
  4. 4.39² =
  5. 5.19² =
  6. 6.49² =
  7. 7.31² =
  8. 8.71² =
  9. 9.49² =
  10. 10.21² =
  11. 11.51² =
  12. 12.91² =
  13. 13.81² =
  14. 14.21² =
  15. 15.29² =
  16. 16.91² =
  17. 17.69² =
  18. 18.39² =
  19. 19.21² =
  20. 20.79² =
  21. 21.89² =
  22. 22.59² =
  23. 23.41² =
  24. 24.69² =
  25. 25.69² =
  26. 26.29² =
  27. 27.29² =
  28. 28.59² =
  29. 29.79² =
  30. 30.61² =
  31. 31.31² =
  32. 32.59² =
  33. 33.81² =
  34. 34.29² =
  35. 35.51² =
  36. 36.49² =
  37. 37.41² =
  38. 38.69² =
  39. 39.19² =
  40. 40.31² =

Answer key

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

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