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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 103 · 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. 1.79² =
  2. 2.69² =
  3. 3.81² =
  4. 4.59² =
  5. 5.39² =
  6. 6.59² =
  7. 7.29² =
  8. 8.59² =
  9. 9.61² =
  10. 10.51² =
  11. 11.21² =
  12. 12.29² =
  13. 13.41² =
  14. 14.81² =
  15. 15.51² =
  16. 16.49² =
  17. 17.41² =
  18. 18.49² =
  19. 19.31² =
  20. 20.59² =
  21. 21.19² =
  22. 22.71² =
  23. 23.89² =
  24. 24.81² =
  25. 25.69² =
  26. 26.59² =
  27. 27.71² =
  28. 28.89² =
  29. 29.89² =
  30. 30.51² =
  31. 31.79² =
  32. 32.61² =
  33. 33.41² =
  34. 34.91² =
  35. 35.39² =
  36. 36.89² =
  37. 37.29² =
  38. 38.29² =
  39. 39.31² =
  40. 40.61² =

Answer key

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

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