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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 596 · 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. 1.49² =
  2. 2.39² =
  3. 3.81² =
  4. 4.51² =
  5. 5.51² =
  6. 6.79² =
  7. 7.39² =
  8. 8.91² =
  9. 9.79² =
  10. 10.31² =
  11. 11.51² =
  12. 12.89² =
  13. 13.39² =
  14. 14.79² =
  15. 15.29² =
  16. 16.59² =
  17. 17.59² =
  18. 18.49² =
  19. 19.69² =
  20. 20.51² =
  21. 21.59² =
  22. 22.59² =
  23. 23.31² =
  24. 24.91² =
  25. 25.19² =
  26. 26.19² =
  27. 27.91² =
  28. 28.19² =
  29. 29.81² =
  30. 30.51² =
  31. 31.21² =
  32. 32.21² =
  33. 33.69² =
  34. 34.19² =
  35. 35.91² =
  36. 36.61² =
  37. 37.41² =
  38. 38.71² =
  39. 39.51² =
  40. 40.49² =

Answer key

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

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