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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 105 · 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. 1.59² =
  2. 2.19² =
  3. 3.51² =
  4. 4.71² =
  5. 5.19² =
  6. 6.21² =
  7. 7.61² =
  8. 8.59² =
  9. 9.61² =
  10. 10.61² =
  11. 11.91² =
  12. 12.71² =
  13. 13.61² =
  14. 14.41² =
  15. 15.51² =
  16. 16.39² =
  17. 17.31² =
  18. 18.69² =
  19. 19.71² =
  20. 20.21² =
  21. 21.61² =
  22. 22.21² =
  23. 23.19² =
  24. 24.41² =
  25. 25.81² =
  26. 26.71² =
  27. 27.71² =
  28. 28.49² =
  29. 29.29² =
  30. 30.81² =
  31. 31.59² =
  32. 32.51² =
  33. 33.39² =
  34. 34.21² =
  35. 35.89² =
  36. 36.29² =
  37. 37.69² =
  38. 38.19² =
  39. 39.21² =
  40. 40.69² =

Answer key

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

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