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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 718 · 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. 2.31² =
  3. 3.71² =
  4. 4.41² =
  5. 5.89² =
  6. 6.91² =
  7. 7.59² =
  8. 8.69² =
  9. 9.19² =
  10. 10.19² =
  11. 11.59² =
  12. 12.61² =
  13. 13.31² =
  14. 14.91² =
  15. 15.69² =
  16. 16.39² =
  17. 17.81² =
  18. 18.89² =
  19. 19.19² =
  20. 20.41² =
  21. 21.31² =
  22. 22.71² =
  23. 23.29² =
  24. 24.41² =
  25. 25.49² =
  26. 26.89² =
  27. 27.79² =
  28. 28.21² =
  29. 29.51² =
  30. 30.61² =
  31. 31.31² =
  32. 32.91² =
  33. 33.89² =
  34. 34.49² =
  35. 35.19² =
  36. 36.89² =
  37. 37.59² =
  38. 38.21² =
  39. 39.29² =
  40. 40.51² =

Answer key

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

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