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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 225 · 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. 1.31² =
  2. 2.89² =
  3. 3.71² =
  4. 4.51² =
  5. 5.79² =
  6. 6.69² =
  7. 7.79² =
  8. 8.81² =
  9. 9.21² =
  10. 10.81² =
  11. 11.59² =
  12. 12.79² =
  13. 13.29² =
  14. 14.29² =
  15. 15.79² =
  16. 16.41² =
  17. 17.79² =
  18. 18.39² =
  19. 19.69² =
  20. 20.79² =
  21. 21.89² =
  22. 22.39² =
  23. 23.21² =
  24. 24.91² =
  25. 25.49² =
  26. 26.79² =
  27. 27.51² =
  28. 28.41² =
  29. 29.71² =
  30. 30.91² =
  31. 31.81² =
  32. 32.29² =
  33. 33.21² =
  34. 34.29² =
  35. 35.61² =
  36. 36.59² =
  37. 37.31² =
  38. 38.49² =
  39. 39.21² =
  40. 40.21² =

Answer key

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

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