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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 739 · 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. 1.59² =
  2. 2.19² =
  3. 3.89² =
  4. 4.69² =
  5. 5.49² =
  6. 6.79² =
  7. 7.79² =
  8. 8.81² =
  9. 9.29² =
  10. 10.69² =
  11. 11.59² =
  12. 12.41² =
  13. 13.41² =
  14. 14.89² =
  15. 15.31² =
  16. 16.89² =
  17. 17.79² =
  18. 18.69² =
  19. 19.71² =
  20. 20.39² =
  21. 21.31² =
  22. 22.89² =
  23. 23.69² =
  24. 24.41² =
  25. 25.21² =
  26. 26.51² =
  27. 27.19² =
  28. 28.31² =
  29. 29.29² =
  30. 30.79² =
  31. 31.29² =
  32. 32.29² =
  33. 33.41² =
  34. 34.69² =
  35. 35.31² =
  36. 36.91² =
  37. 37.81² =
  38. 38.61² =
  39. 39.69² =
  40. 40.69² =

Answer key

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

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