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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 83 · 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. 1.39² =
  2. 2.39² =
  3. 3.31² =
  4. 4.39² =
  5. 5.31² =
  6. 6.91² =
  7. 7.39² =
  8. 8.31² =
  9. 9.19² =
  10. 10.49² =
  11. 11.49² =
  12. 12.39² =
  13. 13.19² =
  14. 14.41² =
  15. 15.19² =
  16. 16.79² =
  17. 17.41² =
  18. 18.29² =
  19. 19.79² =
  20. 20.89² =
  21. 21.19² =
  22. 22.21² =
  23. 23.41² =
  24. 24.49² =
  25. 25.59² =
  26. 26.51² =
  27. 27.69² =
  28. 28.61² =
  29. 29.69² =
  30. 30.29² =
  31. 31.89² =
  32. 32.69² =
  33. 33.29² =
  34. 34.19² =
  35. 35.91² =
  36. 36.71² =
  37. 37.59² =
  38. 38.29² =
  39. 39.19² =
  40. 40.29² =

Answer key

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

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