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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 672 · 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. 1.19² =
  2. 2.39² =
  3. 3.91² =
  4. 4.81² =
  5. 5.89² =
  6. 6.29² =
  7. 7.49² =
  8. 8.69² =
  9. 9.59² =
  10. 10.61² =
  11. 11.39² =
  12. 12.59² =
  13. 13.71² =
  14. 14.69² =
  15. 15.89² =
  16. 16.61² =
  17. 17.49² =
  18. 18.31² =
  19. 19.89² =
  20. 20.29² =
  21. 21.41² =
  22. 22.71² =
  23. 23.79² =
  24. 24.79² =
  25. 25.89² =
  26. 26.41² =
  27. 27.41² =
  28. 28.39² =
  29. 29.59² =
  30. 30.19² =
  31. 31.79² =
  32. 32.81² =
  33. 33.19² =
  34. 34.71² =
  35. 35.89² =
  36. 36.79² =
  37. 37.51² =
  38. 38.29² =
  39. 39.41² =
  40. 40.69² =

Answer key

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

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