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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 185 · 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. 2.29² =
  3. 3.21² =
  4. 4.89² =
  5. 5.59² =
  6. 6.79² =
  7. 7.89² =
  8. 8.91² =
  9. 9.81² =
  10. 10.51² =
  11. 11.51² =
  12. 12.29² =
  13. 13.79² =
  14. 14.81² =
  15. 15.49² =
  16. 16.71² =
  17. 17.29² =
  18. 18.31² =
  19. 19.59² =
  20. 20.91² =
  21. 21.59² =
  22. 22.19² =
  23. 23.89² =
  24. 24.71² =
  25. 25.59² =
  26. 26.51² =
  27. 27.21² =
  28. 28.91² =
  29. 29.31² =
  30. 30.39² =
  31. 31.61² =
  32. 32.89² =
  33. 33.19² =
  34. 34.29² =
  35. 35.41² =
  36. 36.51² =
  37. 37.41² =
  38. 38.59² =
  39. 39.91² =
  40. 40.19² =

Answer key

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

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