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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 158 · 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. 1.81² =
  2. 2.89² =
  3. 3.39² =
  4. 4.29² =
  5. 5.81² =
  6. 6.71² =
  7. 7.29² =
  8. 8.91² =
  9. 9.69² =
  10. 10.51² =
  11. 11.79² =
  12. 12.49² =
  13. 13.31² =
  14. 14.79² =
  15. 15.69² =
  16. 16.39² =
  17. 17.39² =
  18. 18.81² =
  19. 19.69² =
  20. 20.69² =
  21. 21.31² =
  22. 22.59² =
  23. 23.71² =
  24. 24.41² =
  25. 25.69² =
  26. 26.69² =
  27. 27.89² =
  28. 28.59² =
  29. 29.29² =
  30. 30.39² =
  31. 31.41² =
  32. 32.71² =
  33. 33.79² =
  34. 34.21² =
  35. 35.59² =
  36. 36.41² =
  37. 37.81² =
  38. 38.51² =
  39. 39.29² =
  40. 40.61² =

Answer key

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

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