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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 433 · 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. 1.61² =
  2. 2.19² =
  3. 3.39² =
  4. 4.71² =
  5. 5.51² =
  6. 6.89² =
  7. 7.89² =
  8. 8.21² =
  9. 9.59² =
  10. 10.79² =
  11. 11.19² =
  12. 12.79² =
  13. 13.19² =
  14. 14.39² =
  15. 15.79² =
  16. 16.21² =
  17. 17.41² =
  18. 18.81² =
  19. 19.49² =
  20. 20.41² =
  21. 21.71² =
  22. 22.39² =
  23. 23.41² =
  24. 24.69² =
  25. 25.21² =
  26. 26.31² =
  27. 27.29² =
  28. 28.49² =
  29. 29.21² =
  30. 30.61² =
  31. 31.51² =
  32. 32.21² =
  33. 33.49² =
  34. 34.89² =
  35. 35.91² =
  36. 36.21² =
  37. 37.51² =
  38. 38.71² =
  39. 39.31² =
  40. 40.21² =

Answer key

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

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