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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 587 · 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. 2.89² =
  3. 3.71² =
  4. 4.51² =
  5. 5.21² =
  6. 6.21² =
  7. 7.41² =
  8. 8.41² =
  9. 9.41² =
  10. 10.39² =
  11. 11.29² =
  12. 12.61² =
  13. 13.61² =
  14. 14.61² =
  15. 15.41² =
  16. 16.81² =
  17. 17.19² =
  18. 18.39² =
  19. 19.39² =
  20. 20.31² =
  21. 21.79² =
  22. 22.91² =
  23. 23.61² =
  24. 24.49² =
  25. 25.41² =
  26. 26.59² =
  27. 27.69² =
  28. 28.79² =
  29. 29.51² =
  30. 30.49² =
  31. 31.61² =
  32. 32.59² =
  33. 33.79² =
  34. 34.59² =
  35. 35.39² =
  36. 36.31² =
  37. 37.81² =
  38. 38.21² =
  39. 39.59² =
  40. 40.89² =

Answer key

  1. 2601
  2. 7921
  3. 5041
  4. 2601
  5. 441
  6. 441
  7. 1681
  8. 1681
  9. 1681
  10. 1521
  11. 841
  12. 3721
  13. 3721
  14. 3721
  15. 1681
  16. 6561
  17. 361
  18. 1521
  19. 1521
  20. 961
  21. 6241
  22. 8281
  23. 3721
  24. 2401
  25. 1681
  26. 3481
  27. 4761
  28. 6241
  29. 2601
  30. 2401
  31. 3721
  32. 3481
  33. 6241
  34. 3481
  35. 1521
  36. 961
  37. 6561
  38. 441
  39. 3481
  40. 7921

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