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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 589 · 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. 1.79² =
  2. 2.19² =
  3. 3.31² =
  4. 4.19² =
  5. 5.21² =
  6. 6.71² =
  7. 7.51² =
  8. 8.21² =
  9. 9.49² =
  10. 10.39² =
  11. 11.41² =
  12. 12.51² =
  13. 13.59² =
  14. 14.39² =
  15. 15.29² =
  16. 16.69² =
  17. 17.19² =
  18. 18.21² =
  19. 19.89² =
  20. 20.89² =
  21. 21.39² =
  22. 22.79² =
  23. 23.29² =
  24. 24.49² =
  25. 25.39² =
  26. 26.49² =
  27. 27.91² =
  28. 28.49² =
  29. 29.59² =
  30. 30.51² =
  31. 31.81² =
  32. 32.49² =
  33. 33.61² =
  34. 34.19² =
  35. 35.71² =
  36. 36.31² =
  37. 37.71² =
  38. 38.41² =
  39. 39.91² =
  40. 40.29² =

Answer key

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

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