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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 789 · 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. 1.69² =
  2. 2.89² =
  3. 3.29² =
  4. 4.61² =
  5. 5.59² =
  6. 6.71² =
  7. 7.29² =
  8. 8.79² =
  9. 9.29² =
  10. 10.81² =
  11. 11.19² =
  12. 12.21² =
  13. 13.89² =
  14. 14.51² =
  15. 15.41² =
  16. 16.41² =
  17. 17.29² =
  18. 18.31² =
  19. 19.91² =
  20. 20.19² =
  21. 21.29² =
  22. 22.51² =
  23. 23.49² =
  24. 24.89² =
  25. 25.79² =
  26. 26.39² =
  27. 27.89² =
  28. 28.49² =
  29. 29.21² =
  30. 30.41² =
  31. 31.51² =
  32. 32.19² =
  33. 33.91² =
  34. 34.59² =
  35. 35.79² =
  36. 36.19² =
  37. 37.19² =
  38. 38.59² =
  39. 39.89² =
  40. 40.21² =

Answer key

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

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