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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 622 · 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. 1.39² =
  2. 2.89² =
  3. 3.31² =
  4. 4.29² =
  5. 5.81² =
  6. 6.21² =
  7. 7.41² =
  8. 8.81² =
  9. 9.49² =
  10. 10.51² =
  11. 11.29² =
  12. 12.39² =
  13. 13.49² =
  14. 14.49² =
  15. 15.71² =
  16. 16.31² =
  17. 17.61² =
  18. 18.41² =
  19. 19.29² =
  20. 20.61² =
  21. 21.89² =
  22. 22.89² =
  23. 23.31² =
  24. 24.31² =
  25. 25.79² =
  26. 26.29² =
  27. 27.29² =
  28. 28.21² =
  29. 29.21² =
  30. 30.19² =
  31. 31.81² =
  32. 32.79² =
  33. 33.49² =
  34. 34.61² =
  35. 35.81² =
  36. 36.61² =
  37. 37.81² =
  38. 38.61² =
  39. 39.79² =
  40. 40.89² =

Answer key

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

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