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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 231 · 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. 1.21² =
  2. 2.29² =
  3. 3.79² =
  4. 4.49² =
  5. 5.29² =
  6. 6.61² =
  7. 7.71² =
  8. 8.41² =
  9. 9.71² =
  10. 10.61² =
  11. 11.79² =
  12. 12.51² =
  13. 13.69² =
  14. 14.89² =
  15. 15.41² =
  16. 16.59² =
  17. 17.29² =
  18. 18.19² =
  19. 19.51² =
  20. 20.81² =
  21. 21.49² =
  22. 22.29² =
  23. 23.79² =
  24. 24.61² =
  25. 25.89² =
  26. 26.69² =
  27. 27.21² =
  28. 28.71² =
  29. 29.21² =
  30. 30.91² =
  31. 31.21² =
  32. 32.41² =
  33. 33.69² =
  34. 34.39² =
  35. 35.31² =
  36. 36.81² =
  37. 37.49² =
  38. 38.19² =
  39. 39.89² =
  40. 40.69² =

Answer key

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

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