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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 852 · 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. 1.89² =
  2. 2.91² =
  3. 3.69² =
  4. 4.71² =
  5. 5.69² =
  6. 6.39² =
  7. 7.89² =
  8. 8.41² =
  9. 9.31² =
  10. 10.59² =
  11. 11.79² =
  12. 12.41² =
  13. 13.71² =
  14. 14.61² =
  15. 15.39² =
  16. 16.49² =
  17. 17.91² =
  18. 18.81² =
  19. 19.31² =
  20. 20.81² =
  21. 21.69² =
  22. 22.39² =
  23. 23.31² =
  24. 24.41² =
  25. 25.51² =
  26. 26.29² =
  27. 27.89² =
  28. 28.89² =
  29. 29.49² =
  30. 30.39² =
  31. 31.79² =
  32. 32.89² =
  33. 33.61² =
  34. 34.51² =
  35. 35.61² =
  36. 36.21² =
  37. 37.61² =
  38. 38.81² =
  39. 39.79² =
  40. 40.49² =

Answer key

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

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