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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 167 · 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. 2.39² =
  3. 3.49² =
  4. 4.59² =
  5. 5.29² =
  6. 6.29² =
  7. 7.61² =
  8. 8.79² =
  9. 9.89² =
  10. 10.49² =
  11. 11.59² =
  12. 12.59² =
  13. 13.39² =
  14. 14.89² =
  15. 15.19² =
  16. 16.39² =
  17. 17.51² =
  18. 18.51² =
  19. 19.51² =
  20. 20.31² =
  21. 21.91² =
  22. 22.49² =
  23. 23.41² =
  24. 24.81² =
  25. 25.29² =
  26. 26.49² =
  27. 27.59² =
  28. 28.49² =
  29. 29.19² =
  30. 30.61² =
  31. 31.91² =
  32. 32.29² =
  33. 33.59² =
  34. 34.19² =
  35. 35.51² =
  36. 36.31² =
  37. 37.91² =
  38. 38.21² =
  39. 39.59² =
  40. 40.71² =

Answer key

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

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