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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 217 · 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. 1.89² =
  2. 2.59² =
  3. 3.49² =
  4. 4.81² =
  5. 5.19² =
  6. 6.39² =
  7. 7.39² =
  8. 8.91² =
  9. 9.21² =
  10. 10.79² =
  11. 11.69² =
  12. 12.29² =
  13. 13.31² =
  14. 14.39² =
  15. 15.89² =
  16. 16.51² =
  17. 17.89² =
  18. 18.71² =
  19. 19.29² =
  20. 20.49² =
  21. 21.71² =
  22. 22.31² =
  23. 23.91² =
  24. 24.61² =
  25. 25.21² =
  26. 26.29² =
  27. 27.69² =
  28. 28.61² =
  29. 29.51² =
  30. 30.31² =
  31. 31.21² =
  32. 32.79² =
  33. 33.81² =
  34. 34.51² =
  35. 35.49² =
  36. 36.91² =
  37. 37.31² =
  38. 38.21² =
  39. 39.89² =
  40. 40.89² =

Answer key

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

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