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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 608 · 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. 2.41² =
  3. 3.19² =
  4. 4.89² =
  5. 5.59² =
  6. 6.29² =
  7. 7.91² =
  8. 8.51² =
  9. 9.29² =
  10. 10.29² =
  11. 11.51² =
  12. 12.79² =
  13. 13.41² =
  14. 14.39² =
  15. 15.21² =
  16. 16.39² =
  17. 17.41² =
  18. 18.21² =
  19. 19.19² =
  20. 20.81² =
  21. 21.39² =
  22. 22.61² =
  23. 23.69² =
  24. 24.61² =
  25. 25.49² =
  26. 26.81² =
  27. 27.39² =
  28. 28.61² =
  29. 29.51² =
  30. 30.29² =
  31. 31.69² =
  32. 32.59² =
  33. 33.31² =
  34. 34.61² =
  35. 35.59² =
  36. 36.19² =
  37. 37.21² =
  38. 38.91² =
  39. 39.29² =
  40. 40.79² =

Answer key

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

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