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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 93 · 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. 1.29² =
  2. 2.49² =
  3. 3.39² =
  4. 4.49² =
  5. 5.79² =
  6. 6.89² =
  7. 7.51² =
  8. 8.69² =
  9. 9.19² =
  10. 10.19² =
  11. 11.31² =
  12. 12.61² =
  13. 13.69² =
  14. 14.29² =
  15. 15.29² =
  16. 16.91² =
  17. 17.91² =
  18. 18.81² =
  19. 19.39² =
  20. 20.19² =
  21. 21.29² =
  22. 22.29² =
  23. 23.71² =
  24. 24.59² =
  25. 25.29² =
  26. 26.19² =
  27. 27.51² =
  28. 28.91² =
  29. 29.39² =
  30. 30.59² =
  31. 31.39² =
  32. 32.41² =
  33. 33.59² =
  34. 34.31² =
  35. 35.41² =
  36. 36.31² =
  37. 37.31² =
  38. 38.29² =
  39. 39.21² =
  40. 40.89² =

Answer key

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

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