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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 699 · 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. 1.19² =
  2. 2.59² =
  3. 3.71² =
  4. 4.51² =
  5. 5.89² =
  6. 6.69² =
  7. 7.29² =
  8. 8.59² =
  9. 9.41² =
  10. 10.61² =
  11. 11.91² =
  12. 12.41² =
  13. 13.89² =
  14. 14.79² =
  15. 15.79² =
  16. 16.59² =
  17. 17.49² =
  18. 18.21² =
  19. 19.39² =
  20. 20.31² =
  21. 21.49² =
  22. 22.79² =
  23. 23.61² =
  24. 24.31² =
  25. 25.41² =
  26. 26.19² =
  27. 27.91² =
  28. 28.69² =
  29. 29.51² =
  30. 30.21² =
  31. 31.59² =
  32. 32.89² =
  33. 33.69² =
  34. 34.59² =
  35. 35.81² =
  36. 36.31² =
  37. 37.41² =
  38. 38.79² =
  39. 39.49² =
  40. 40.51² =

Answer key

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

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