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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 389 · 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. 1.91² =
  2. 2.21² =
  3. 3.49² =
  4. 4.29² =
  5. 5.61² =
  6. 6.51² =
  7. 7.79² =
  8. 8.31² =
  9. 9.89² =
  10. 10.39² =
  11. 11.81² =
  12. 12.19² =
  13. 13.51² =
  14. 14.61² =
  15. 15.31² =
  16. 16.69² =
  17. 17.81² =
  18. 18.41² =
  19. 19.39² =
  20. 20.61² =
  21. 21.51² =
  22. 22.19² =
  23. 23.91² =
  24. 24.79² =
  25. 25.29² =
  26. 26.51² =
  27. 27.19² =
  28. 28.39² =
  29. 29.89² =
  30. 30.21² =
  31. 31.91² =
  32. 32.89² =
  33. 33.79² =
  34. 34.49² =
  35. 35.39² =
  36. 36.59² =
  37. 37.71² =
  38. 38.39² =
  39. 39.91² =
  40. 40.61² =

Answer key

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

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