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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 304 · 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. 1.39² =
  2. 2.21² =
  3. 3.29² =
  4. 4.51² =
  5. 5.71² =
  6. 6.51² =
  7. 7.71² =
  8. 8.89² =
  9. 9.79² =
  10. 10.19² =
  11. 11.81² =
  12. 12.69² =
  13. 13.59² =
  14. 14.19² =
  15. 15.71² =
  16. 16.21² =
  17. 17.39² =
  18. 18.41² =
  19. 19.69² =
  20. 20.31² =
  21. 21.21² =
  22. 22.41² =
  23. 23.31² =
  24. 24.21² =
  25. 25.79² =
  26. 26.91² =
  27. 27.39² =
  28. 28.49² =
  29. 29.71² =
  30. 30.89² =
  31. 31.21² =
  32. 32.29² =
  33. 33.69² =
  34. 34.79² =
  35. 35.61² =
  36. 36.49² =
  37. 37.79² =
  38. 38.29² =
  39. 39.29² =
  40. 40.49² =

Answer key

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

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