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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 503 · 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. 1.91² =
  2. 2.49² =
  3. 3.59² =
  4. 4.91² =
  5. 5.89² =
  6. 6.89² =
  7. 7.79² =
  8. 8.61² =
  9. 9.29² =
  10. 10.21² =
  11. 11.39² =
  12. 12.29² =
  13. 13.69² =
  14. 14.41² =
  15. 15.49² =
  16. 16.91² =
  17. 17.59² =
  18. 18.69² =
  19. 19.69² =
  20. 20.31² =
  21. 21.51² =
  22. 22.49² =
  23. 23.49² =
  24. 24.79² =
  25. 25.61² =
  26. 26.69² =
  27. 27.41² =
  28. 28.89² =
  29. 29.59² =
  30. 30.41² =
  31. 31.89² =
  32. 32.49² =
  33. 33.79² =
  34. 34.69² =
  35. 35.31² =
  36. 36.41² =
  37. 37.49² =
  38. 38.31² =
  39. 39.21² =
  40. 40.79² =

Answer key

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

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