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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 453 · 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. 1.71² =
  2. 2.79² =
  3. 3.51² =
  4. 4.49² =
  5. 5.29² =
  6. 6.51² =
  7. 7.51² =
  8. 8.21² =
  9. 9.69² =
  10. 10.21² =
  11. 11.21² =
  12. 12.29² =
  13. 13.21² =
  14. 14.19² =
  15. 15.39² =
  16. 16.39² =
  17. 17.21² =
  18. 18.31² =
  19. 19.89² =
  20. 20.89² =
  21. 21.41² =
  22. 22.51² =
  23. 23.41² =
  24. 24.31² =
  25. 25.59² =
  26. 26.91² =
  27. 27.79² =
  28. 28.79² =
  29. 29.61² =
  30. 30.41² =
  31. 31.51² =
  32. 32.21² =
  33. 33.91² =
  34. 34.19² =
  35. 35.41² =
  36. 36.59² =
  37. 37.71² =
  38. 38.29² =
  39. 39.51² =
  40. 40.61² =

Answer key

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

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