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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 143 · 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. 2.89² =
  3. 3.59² =
  4. 4.71² =
  5. 5.29² =
  6. 6.61² =
  7. 7.69² =
  8. 8.29² =
  9. 9.61² =
  10. 10.61² =
  11. 11.69² =
  12. 12.19² =
  13. 13.91² =
  14. 14.51² =
  15. 15.91² =
  16. 16.89² =
  17. 17.29² =
  18. 18.21² =
  19. 19.29² =
  20. 20.81² =
  21. 21.21² =
  22. 22.21² =
  23. 23.71² =
  24. 24.71² =
  25. 25.89² =
  26. 26.21² =
  27. 27.59² =
  28. 28.71² =
  29. 29.29² =
  30. 30.49² =
  31. 31.39² =
  32. 32.61² =
  33. 33.31² =
  34. 34.61² =
  35. 35.59² =
  36. 36.41² =
  37. 37.19² =
  38. 38.81² =
  39. 39.41² =
  40. 40.69² =

Answer key

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

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