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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 651 · 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. 1.41² =
  2. 2.41² =
  3. 3.69² =
  4. 4.31² =
  5. 5.79² =
  6. 6.51² =
  7. 7.19² =
  8. 8.19² =
  9. 9.91² =
  10. 10.49² =
  11. 11.51² =
  12. 12.79² =
  13. 13.51² =
  14. 14.21² =
  15. 15.41² =
  16. 16.89² =
  17. 17.79² =
  18. 18.39² =
  19. 19.31² =
  20. 20.71² =
  21. 21.89² =
  22. 22.21² =
  23. 23.89² =
  24. 24.49² =
  25. 25.19² =
  26. 26.59² =
  27. 27.71² =
  28. 28.21² =
  29. 29.21² =
  30. 30.29² =
  31. 31.81² =
  32. 32.29² =
  33. 33.61² =
  34. 34.31² =
  35. 35.81² =
  36. 36.21² =
  37. 37.29² =
  38. 38.81² =
  39. 39.69² =
  40. 40.61² =

Answer key

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

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