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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 75 · 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. 2.51² =
  3. 3.39² =
  4. 4.31² =
  5. 5.19² =
  6. 6.31² =
  7. 7.41² =
  8. 8.29² =
  9. 9.21² =
  10. 10.51² =
  11. 11.51² =
  12. 12.41² =
  13. 13.49² =
  14. 14.31² =
  15. 15.39² =
  16. 16.41² =
  17. 17.79² =
  18. 18.79² =
  19. 19.29² =
  20. 20.19² =
  21. 21.79² =
  22. 22.19² =
  23. 23.89² =
  24. 24.39² =
  25. 25.31² =
  26. 26.41² =
  27. 27.79² =
  28. 28.71² =
  29. 29.79² =
  30. 30.41² =
  31. 31.69² =
  32. 32.91² =
  33. 33.39² =
  34. 34.89² =
  35. 35.49² =
  36. 36.89² =
  37. 37.49² =
  38. 38.79² =
  39. 39.61² =
  40. 40.81² =

Answer key

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

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