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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 317 · 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. 1.89² =
  2. 2.59² =
  3. 3.61² =
  4. 4.61² =
  5. 5.51² =
  6. 6.79² =
  7. 7.91² =
  8. 8.41² =
  9. 9.59² =
  10. 10.31² =
  11. 11.81² =
  12. 12.89² =
  13. 13.39² =
  14. 14.61² =
  15. 15.81² =
  16. 16.69² =
  17. 17.81² =
  18. 18.61² =
  19. 19.21² =
  20. 20.69² =
  21. 21.51² =
  22. 22.61² =
  23. 23.49² =
  24. 24.41² =
  25. 25.69² =
  26. 26.31² =
  27. 27.69² =
  28. 28.59² =
  29. 29.29² =
  30. 30.79² =
  31. 31.89² =
  32. 32.21² =
  33. 33.81² =
  34. 34.29² =
  35. 35.39² =
  36. 36.61² =
  37. 37.19² =
  38. 38.69² =
  39. 39.19² =
  40. 40.79² =

Answer key

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

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