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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 63 · 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. 1.29² =
  2. 2.79² =
  3. 3.21² =
  4. 4.91² =
  5. 5.21² =
  6. 6.39² =
  7. 7.51² =
  8. 8.49² =
  9. 9.51² =
  10. 10.79² =
  11. 11.49² =
  12. 12.41² =
  13. 13.71² =
  14. 14.39² =
  15. 15.31² =
  16. 16.31² =
  17. 17.61² =
  18. 18.69² =
  19. 19.21² =
  20. 20.21² =
  21. 21.31² =
  22. 22.29² =
  23. 23.41² =
  24. 24.89² =
  25. 25.71² =
  26. 26.61² =
  27. 27.91² =
  28. 28.61² =
  29. 29.29² =
  30. 30.81² =
  31. 31.49² =
  32. 32.19² =
  33. 33.51² =
  34. 34.91² =
  35. 35.59² =
  36. 36.49² =
  37. 37.29² =
  38. 38.69² =
  39. 39.31² =
  40. 40.29² =

Answer key

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

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