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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 238 · 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. 1.69² =
  2. 2.19² =
  3. 3.31² =
  4. 4.51² =
  5. 5.81² =
  6. 6.41² =
  7. 7.49² =
  8. 8.39² =
  9. 9.21² =
  10. 10.89² =
  11. 11.71² =
  12. 12.59² =
  13. 13.59² =
  14. 14.69² =
  15. 15.29² =
  16. 16.31² =
  17. 17.59² =
  18. 18.69² =
  19. 19.69² =
  20. 20.31² =
  21. 21.91² =
  22. 22.59² =
  23. 23.69² =
  24. 24.51² =
  25. 25.59² =
  26. 26.59² =
  27. 27.21² =
  28. 28.69² =
  29. 29.69² =
  30. 30.89² =
  31. 31.29² =
  32. 32.19² =
  33. 33.21² =
  34. 34.21² =
  35. 35.41² =
  36. 36.61² =
  37. 37.51² =
  38. 38.71² =
  39. 39.51² =
  40. 40.21² =

Answer key

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

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