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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 203 · 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. 1.31² =
  2. 2.39² =
  3. 3.79² =
  4. 4.41² =
  5. 5.21² =
  6. 6.49² =
  7. 7.31² =
  8. 8.21² =
  9. 9.81² =
  10. 10.49² =
  11. 11.41² =
  12. 12.81² =
  13. 13.81² =
  14. 14.49² =
  15. 15.81² =
  16. 16.79² =
  17. 17.69² =
  18. 18.89² =
  19. 19.91² =
  20. 20.39² =
  21. 21.71² =
  22. 22.39² =
  23. 23.49² =
  24. 24.41² =
  25. 25.89² =
  26. 26.71² =
  27. 27.51² =
  28. 28.91² =
  29. 29.39² =
  30. 30.81² =
  31. 31.19² =
  32. 32.31² =
  33. 33.69² =
  34. 34.21² =
  35. 35.19² =
  36. 36.31² =
  37. 37.29² =
  38. 38.41² =
  39. 39.91² =
  40. 40.59² =

Answer key

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

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