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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 731 · 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. 1.39² =
  2. 2.41² =
  3. 3.89² =
  4. 4.89² =
  5. 5.81² =
  6. 6.71² =
  7. 7.41² =
  8. 8.39² =
  9. 9.91² =
  10. 10.79² =
  11. 11.49² =
  12. 12.49² =
  13. 13.19² =
  14. 14.31² =
  15. 15.29² =
  16. 16.21² =
  17. 17.61² =
  18. 18.19² =
  19. 19.59² =
  20. 20.51² =
  21. 21.81² =
  22. 22.19² =
  23. 23.79² =
  24. 24.31² =
  25. 25.41² =
  26. 26.81² =
  27. 27.59² =
  28. 28.41² =
  29. 29.49² =
  30. 30.61² =
  31. 31.71² =
  32. 32.81² =
  33. 33.91² =
  34. 34.19² =
  35. 35.71² =
  36. 36.91² =
  37. 37.91² =
  38. 38.61² =
  39. 39.49² =
  40. 40.79² =

Answer key

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

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