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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 409 · 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. 1.79² =
  2. 2.49² =
  3. 3.19² =
  4. 4.71² =
  5. 5.69² =
  6. 6.81² =
  7. 7.41² =
  8. 8.49² =
  9. 9.31² =
  10. 10.59² =
  11. 11.71² =
  12. 12.59² =
  13. 13.31² =
  14. 14.41² =
  15. 15.31² =
  16. 16.29² =
  17. 17.61² =
  18. 18.21² =
  19. 19.21² =
  20. 20.79² =
  21. 21.41² =
  22. 22.51² =
  23. 23.31² =
  24. 24.49² =
  25. 25.19² =
  26. 26.41² =
  27. 27.41² =
  28. 28.31² =
  29. 29.61² =
  30. 30.39² =
  31. 31.71² =
  32. 32.71² =
  33. 33.39² =
  34. 34.71² =
  35. 35.39² =
  36. 36.61² =
  37. 37.41² =
  38. 38.51² =
  39. 39.81² =
  40. 40.21² =

Answer key

  1. 6241
  2. 2401
  3. 361
  4. 5041
  5. 4761
  6. 6561
  7. 1681
  8. 2401
  9. 961
  10. 3481
  11. 5041
  12. 3481
  13. 961
  14. 1681
  15. 961
  16. 841
  17. 3721
  18. 441
  19. 441
  20. 6241
  21. 1681
  22. 2601
  23. 961
  24. 2401
  25. 361
  26. 1681
  27. 1681
  28. 961
  29. 3721
  30. 1521
  31. 5041
  32. 5041
  33. 1521
  34. 5041
  35. 1521
  36. 3721
  37. 1681
  38. 2601
  39. 6561
  40. 441

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