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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 224 · 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. 2.71² =
  3. 3.51² =
  4. 4.81² =
  5. 5.71² =
  6. 6.29² =
  7. 7.59² =
  8. 8.89² =
  9. 9.39² =
  10. 10.49² =
  11. 11.41² =
  12. 12.69² =
  13. 13.21² =
  14. 14.89² =
  15. 15.91² =
  16. 16.39² =
  17. 17.31² =
  18. 18.31² =
  19. 19.79² =
  20. 20.89² =
  21. 21.59² =
  22. 22.81² =
  23. 23.89² =
  24. 24.61² =
  25. 25.29² =
  26. 26.51² =
  27. 27.79² =
  28. 28.51² =
  29. 29.59² =
  30. 30.31² =
  31. 31.51² =
  32. 32.31² =
  33. 33.79² =
  34. 34.89² =
  35. 35.91² =
  36. 36.21² =
  37. 37.51² =
  38. 38.69² =
  39. 39.81² =
  40. 40.61² =

Answer key

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

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