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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 728 · 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. 1.31² =
  2. 2.69² =
  3. 3.49² =
  4. 4.41² =
  5. 5.79² =
  6. 6.81² =
  7. 7.19² =
  8. 8.39² =
  9. 9.21² =
  10. 10.59² =
  11. 11.29² =
  12. 12.39² =
  13. 13.31² =
  14. 14.91² =
  15. 15.59² =
  16. 16.51² =
  17. 17.39² =
  18. 18.21² =
  19. 19.39² =
  20. 20.91² =
  21. 21.29² =
  22. 22.19² =
  23. 23.31² =
  24. 24.49² =
  25. 25.51² =
  26. 26.49² =
  27. 27.39² =
  28. 28.39² =
  29. 29.59² =
  30. 30.31² =
  31. 31.71² =
  32. 32.89² =
  33. 33.61² =
  34. 34.29² =
  35. 35.59² =
  36. 36.29² =
  37. 37.71² =
  38. 38.91² =
  39. 39.71² =
  40. 40.71² =

Answer key

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

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