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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 591 · 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. 2.59² =
  3. 3.71² =
  4. 4.29² =
  5. 5.41² =
  6. 6.41² =
  7. 7.39² =
  8. 8.29² =
  9. 9.91² =
  10. 10.89² =
  11. 11.49² =
  12. 12.89² =
  13. 13.21² =
  14. 14.79² =
  15. 15.41² =
  16. 16.91² =
  17. 17.41² =
  18. 18.41² =
  19. 19.91² =
  20. 20.61² =
  21. 21.39² =
  22. 22.79² =
  23. 23.39² =
  24. 24.31² =
  25. 25.71² =
  26. 26.71² =
  27. 27.81² =
  28. 28.81² =
  29. 29.51² =
  30. 30.79² =
  31. 31.39² =
  32. 32.51² =
  33. 33.21² =
  34. 34.81² =
  35. 35.31² =
  36. 36.21² =
  37. 37.79² =
  38. 38.49² =
  39. 39.61² =
  40. 40.29² =

Answer key

  1. 6241
  2. 3481
  3. 5041
  4. 841
  5. 1681
  6. 1681
  7. 1521
  8. 841
  9. 8281
  10. 7921
  11. 2401
  12. 7921
  13. 441
  14. 6241
  15. 1681
  16. 8281
  17. 1681
  18. 1681
  19. 8281
  20. 3721
  21. 1521
  22. 6241
  23. 1521
  24. 961
  25. 5041
  26. 5041
  27. 6561
  28. 6561
  29. 2601
  30. 6241
  31. 1521
  32. 2601
  33. 441
  34. 6561
  35. 961
  36. 441
  37. 6241
  38. 2401
  39. 3721
  40. 841

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