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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 414 · 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. 1.51² =
  2. 2.29² =
  3. 3.59² =
  4. 4.39² =
  5. 5.21² =
  6. 6.29² =
  7. 7.71² =
  8. 8.41² =
  9. 9.19² =
  10. 10.71² =
  11. 11.49² =
  12. 12.41² =
  13. 13.89² =
  14. 14.29² =
  15. 15.51² =
  16. 16.49² =
  17. 17.69² =
  18. 18.91² =
  19. 19.51² =
  20. 20.61² =
  21. 21.69² =
  22. 22.31² =
  23. 23.29² =
  24. 24.31² =
  25. 25.69² =
  26. 26.69² =
  27. 27.21² =
  28. 28.71² =
  29. 29.29² =
  30. 30.79² =
  31. 31.39² =
  32. 32.19² =
  33. 33.39² =
  34. 34.21² =
  35. 35.41² =
  36. 36.69² =
  37. 37.91² =
  38. 38.41² =
  39. 39.21² =
  40. 40.51² =

Answer key

  1. 2601
  2. 841
  3. 3481
  4. 1521
  5. 441
  6. 841
  7. 5041
  8. 1681
  9. 361
  10. 5041
  11. 2401
  12. 1681
  13. 7921
  14. 841
  15. 2601
  16. 2401
  17. 4761
  18. 8281
  19. 2601
  20. 3721
  21. 4761
  22. 961
  23. 841
  24. 961
  25. 4761
  26. 4761
  27. 441
  28. 5041
  29. 841
  30. 6241
  31. 1521
  32. 361
  33. 1521
  34. 441
  35. 1681
  36. 4761
  37. 8281
  38. 1681
  39. 441
  40. 2601

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