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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 593 · 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. 1.49² =
  2. 2.19² =
  3. 3.19² =
  4. 4.51² =
  5. 5.19² =
  6. 6.29² =
  7. 7.79² =
  8. 8.21² =
  9. 9.29² =
  10. 10.69² =
  11. 11.39² =
  12. 12.89² =
  13. 13.31² =
  14. 14.29² =
  15. 15.79² =
  16. 16.51² =
  17. 17.81² =
  18. 18.49² =
  19. 19.19² =
  20. 20.59² =
  21. 21.21² =
  22. 22.91² =
  23. 23.31² =
  24. 24.41² =
  25. 25.61² =
  26. 26.51² =
  27. 27.89² =
  28. 28.39² =
  29. 29.19² =
  30. 30.61² =
  31. 31.49² =
  32. 32.59² =
  33. 33.59² =
  34. 34.71² =
  35. 35.39² =
  36. 36.19² =
  37. 37.41² =
  38. 38.81² =
  39. 39.81² =
  40. 40.29² =

Answer key

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

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