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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 594 · 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. 1.69² =
  2. 2.39² =
  3. 3.51² =
  4. 4.69² =
  5. 5.21² =
  6. 6.81² =
  7. 7.89² =
  8. 8.61² =
  9. 9.21² =
  10. 10.61² =
  11. 11.89² =
  12. 12.81² =
  13. 13.49² =
  14. 14.31² =
  15. 15.39² =
  16. 16.31² =
  17. 17.39² =
  18. 18.31² =
  19. 19.71² =
  20. 20.79² =
  21. 21.79² =
  22. 22.71² =
  23. 23.21² =
  24. 24.61² =
  25. 25.19² =
  26. 26.31² =
  27. 27.71² =
  28. 28.81² =
  29. 29.49² =
  30. 30.69² =
  31. 31.51² =
  32. 32.29² =
  33. 33.29² =
  34. 34.49² =
  35. 35.69² =
  36. 36.31² =
  37. 37.59² =
  38. 38.71² =
  39. 39.19² =
  40. 40.79² =

Answer key

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

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