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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 112 · 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. 2.41² =
  3. 3.89² =
  4. 4.39² =
  5. 5.41² =
  6. 6.41² =
  7. 7.91² =
  8. 8.29² =
  9. 9.89² =
  10. 10.21² =
  11. 11.61² =
  12. 12.21² =
  13. 13.71² =
  14. 14.29² =
  15. 15.51² =
  16. 16.41² =
  17. 17.81² =
  18. 18.71² =
  19. 19.31² =
  20. 20.89² =
  21. 21.81² =
  22. 22.31² =
  23. 23.59² =
  24. 24.49² =
  25. 25.19² =
  26. 26.59² =
  27. 27.61² =
  28. 28.89² =
  29. 29.39² =
  30. 30.81² =
  31. 31.29² =
  32. 32.79² =
  33. 33.69² =
  34. 34.59² =
  35. 35.31² =
  36. 36.59² =
  37. 37.69² =
  38. 38.81² =
  39. 39.59² =
  40. 40.69² =

Answer key

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

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