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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 365 · 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. 2.59² =
  3. 3.51² =
  4. 4.51² =
  5. 5.51² =
  6. 6.61² =
  7. 7.91² =
  8. 8.71² =
  9. 9.39² =
  10. 10.41² =
  11. 11.19² =
  12. 12.71² =
  13. 13.21² =
  14. 14.29² =
  15. 15.31² =
  16. 16.79² =
  17. 17.59² =
  18. 18.79² =
  19. 19.41² =
  20. 20.91² =
  21. 21.31² =
  22. 22.69² =
  23. 23.29² =
  24. 24.19² =
  25. 25.29² =
  26. 26.89² =
  27. 27.81² =
  28. 28.71² =
  29. 29.39² =
  30. 30.61² =
  31. 31.31² =
  32. 32.19² =
  33. 33.51² =
  34. 34.29² =
  35. 35.81² =
  36. 36.49² =
  37. 37.21² =
  38. 38.59² =
  39. 39.41² =
  40. 40.71² =

Answer key

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

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