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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 783 · 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. 1.59² =
  2. 2.59² =
  3. 3.69² =
  4. 4.51² =
  5. 5.39² =
  6. 6.31² =
  7. 7.59² =
  8. 8.31² =
  9. 9.51² =
  10. 10.41² =
  11. 11.89² =
  12. 12.39² =
  13. 13.29² =
  14. 14.49² =
  15. 15.41² =
  16. 16.71² =
  17. 17.29² =
  18. 18.21² =
  19. 19.71² =
  20. 20.19² =
  21. 21.31² =
  22. 22.31² =
  23. 23.79² =
  24. 24.91² =
  25. 25.51² =
  26. 26.69² =
  27. 27.49² =
  28. 28.61² =
  29. 29.39² =
  30. 30.69² =
  31. 31.51² =
  32. 32.51² =
  33. 33.79² =
  34. 34.59² =
  35. 35.79² =
  36. 36.21² =
  37. 37.89² =
  38. 38.41² =
  39. 39.39² =
  40. 40.91² =

Answer key

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

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