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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 573 · 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. 1.41² =
  2. 2.49² =
  3. 3.69² =
  4. 4.91² =
  5. 5.49² =
  6. 6.41² =
  7. 7.69² =
  8. 8.79² =
  9. 9.29² =
  10. 10.29² =
  11. 11.71² =
  12. 12.89² =
  13. 13.79² =
  14. 14.71² =
  15. 15.19² =
  16. 16.39² =
  17. 17.59² =
  18. 18.29² =
  19. 19.31² =
  20. 20.19² =
  21. 21.79² =
  22. 22.51² =
  23. 23.59² =
  24. 24.71² =
  25. 25.31² =
  26. 26.41² =
  27. 27.39² =
  28. 28.89² =
  29. 29.81² =
  30. 30.81² =
  31. 31.19² =
  32. 32.91² =
  33. 33.71² =
  34. 34.39² =
  35. 35.31² =
  36. 36.41² =
  37. 37.39² =
  38. 38.79² =
  39. 39.79² =
  40. 40.69² =

Answer key

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

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