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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 631 · 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. 2.89² =
  3. 3.71² =
  4. 4.31² =
  5. 5.29² =
  6. 6.29² =
  7. 7.91² =
  8. 8.49² =
  9. 9.21² =
  10. 10.69² =
  11. 11.19² =
  12. 12.61² =
  13. 13.41² =
  14. 14.19² =
  15. 15.51² =
  16. 16.29² =
  17. 17.89² =
  18. 18.41² =
  19. 19.21² =
  20. 20.29² =
  21. 21.89² =
  22. 22.61² =
  23. 23.79² =
  24. 24.89² =
  25. 25.59² =
  26. 26.41² =
  27. 27.49² =
  28. 28.61² =
  29. 29.81² =
  30. 30.91² =
  31. 31.31² =
  32. 32.19² =
  33. 33.41² =
  34. 34.59² =
  35. 35.71² =
  36. 36.41² =
  37. 37.51² =
  38. 38.19² =
  39. 39.61² =
  40. 40.19² =

Answer key

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

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