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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 78 · 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. 1.89² =
  2. 2.69² =
  3. 3.81² =
  4. 4.89² =
  5. 5.31² =
  6. 6.39² =
  7. 7.51² =
  8. 8.29² =
  9. 9.91² =
  10. 10.91² =
  11. 11.81² =
  12. 12.71² =
  13. 13.31² =
  14. 14.61² =
  15. 15.29² =
  16. 16.69² =
  17. 17.39² =
  18. 18.21² =
  19. 19.49² =
  20. 20.41² =
  21. 21.29² =
  22. 22.61² =
  23. 23.61² =
  24. 24.69² =
  25. 25.49² =
  26. 26.21² =
  27. 27.29² =
  28. 28.19² =
  29. 29.31² =
  30. 30.91² =
  31. 31.79² =
  32. 32.79² =
  33. 33.79² =
  34. 34.89² =
  35. 35.91² =
  36. 36.59² =
  37. 37.89² =
  38. 38.31² =
  39. 39.51² =
  40. 40.81² =

Answer key

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

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