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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 234 · 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. 2.81² =
  3. 3.49² =
  4. 4.61² =
  5. 5.29² =
  6. 6.39² =
  7. 7.41² =
  8. 8.51² =
  9. 9.59² =
  10. 10.91² =
  11. 11.71² =
  12. 12.81² =
  13. 13.29² =
  14. 14.69² =
  15. 15.59² =
  16. 16.79² =
  17. 17.51² =
  18. 18.41² =
  19. 19.19² =
  20. 20.91² =
  21. 21.61² =
  22. 22.89² =
  23. 23.89² =
  24. 24.59² =
  25. 25.61² =
  26. 26.41² =
  27. 27.29² =
  28. 28.59² =
  29. 29.19² =
  30. 30.69² =
  31. 31.41² =
  32. 32.51² =
  33. 33.61² =
  34. 34.51² =
  35. 35.21² =
  36. 36.71² =
  37. 37.49² =
  38. 38.29² =
  39. 39.61² =
  40. 40.69² =

Answer key

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

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