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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 150 · 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. 2.79² =
  3. 3.21² =
  4. 4.69² =
  5. 5.69² =
  6. 6.51² =
  7. 7.61² =
  8. 8.21² =
  9. 9.69² =
  10. 10.39² =
  11. 11.31² =
  12. 12.69² =
  13. 13.19² =
  14. 14.69² =
  15. 15.41² =
  16. 16.91² =
  17. 17.29² =
  18. 18.41² =
  19. 19.51² =
  20. 20.19² =
  21. 21.61² =
  22. 22.21² =
  23. 23.79² =
  24. 24.21² =
  25. 25.41² =
  26. 26.79² =
  27. 27.41² =
  28. 28.59² =
  29. 29.59² =
  30. 30.71² =
  31. 31.29² =
  32. 32.81² =
  33. 33.29² =
  34. 34.59² =
  35. 35.61² =
  36. 36.51² =
  37. 37.31² =
  38. 38.41² =
  39. 39.49² =
  40. 40.21² =

Answer key

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

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