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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 401 · 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. 1.91² =
  2. 2.79² =
  3. 3.31² =
  4. 4.49² =
  5. 5.69² =
  6. 6.19² =
  7. 7.19² =
  8. 8.21² =
  9. 9.91² =
  10. 10.29² =
  11. 11.29² =
  12. 12.61² =
  13. 13.71² =
  14. 14.29² =
  15. 15.91² =
  16. 16.19² =
  17. 17.79² =
  18. 18.41² =
  19. 19.21² =
  20. 20.19² =
  21. 21.19² =
  22. 22.39² =
  23. 23.81² =
  24. 24.19² =
  25. 25.89² =
  26. 26.39² =
  27. 27.21² =
  28. 28.19² =
  29. 29.71² =
  30. 30.91² =
  31. 31.89² =
  32. 32.49² =
  33. 33.41² =
  34. 34.91² =
  35. 35.41² =
  36. 36.51² =
  37. 37.41² =
  38. 38.39² =
  39. 39.69² =
  40. 40.49² =

Answer key

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

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