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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 159 · 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. 2.61² =
  3. 3.49² =
  4. 4.41² =
  5. 5.21² =
  6. 6.51² =
  7. 7.81² =
  8. 8.41² =
  9. 9.29² =
  10. 10.19² =
  11. 11.29² =
  12. 12.19² =
  13. 13.49² =
  14. 14.51² =
  15. 15.61² =
  16. 16.89² =
  17. 17.61² =
  18. 18.51² =
  19. 19.79² =
  20. 20.59² =
  21. 21.31² =
  22. 22.29² =
  23. 23.61² =
  24. 24.59² =
  25. 25.71² =
  26. 26.51² =
  27. 27.41² =
  28. 28.89² =
  29. 29.41² =
  30. 30.51² =
  31. 31.91² =
  32. 32.21² =
  33. 33.81² =
  34. 34.41² =
  35. 35.51² =
  36. 36.41² =
  37. 37.71² =
  38. 38.81² =
  39. 39.39² =
  40. 40.81² =

Answer key

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

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