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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 239 · 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. 2.81² =
  3. 3.61² =
  4. 4.29² =
  5. 5.19² =
  6. 6.39² =
  7. 7.91² =
  8. 8.29² =
  9. 9.71² =
  10. 10.29² =
  11. 11.19² =
  12. 12.41² =
  13. 13.21² =
  14. 14.71² =
  15. 15.71² =
  16. 16.41² =
  17. 17.51² =
  18. 18.39² =
  19. 19.69² =
  20. 20.31² =
  21. 21.81² =
  22. 22.49² =
  23. 23.51² =
  24. 24.61² =
  25. 25.21² =
  26. 26.81² =
  27. 27.21² =
  28. 28.21² =
  29. 29.31² =
  30. 30.29² =
  31. 31.59² =
  32. 32.19² =
  33. 33.69² =
  34. 34.61² =
  35. 35.61² =
  36. 36.41² =
  37. 37.71² =
  38. 38.19² =
  39. 39.79² =
  40. 40.71² =

Answer key

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

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