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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 72 · 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. 1.71² =
  2. 2.19² =
  3. 3.39² =
  4. 4.41² =
  5. 5.59² =
  6. 6.21² =
  7. 7.41² =
  8. 8.29² =
  9. 9.79² =
  10. 10.31² =
  11. 11.51² =
  12. 12.69² =
  13. 13.41² =
  14. 14.29² =
  15. 15.49² =
  16. 16.61² =
  17. 17.29² =
  18. 18.39² =
  19. 19.39² =
  20. 20.39² =
  21. 21.21² =
  22. 22.21² =
  23. 23.19² =
  24. 24.89² =
  25. 25.59² =
  26. 26.41² =
  27. 27.51² =
  28. 28.59² =
  29. 29.89² =
  30. 30.71² =
  31. 31.89² =
  32. 32.29² =
  33. 33.91² =
  34. 34.31² =
  35. 35.39² =
  36. 36.19² =
  37. 37.61² =
  38. 38.81² =
  39. 39.49² =
  40. 40.19² =

Answer key

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

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