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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 798 · 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. 1.61² =
  2. 2.31² =
  3. 3.69² =
  4. 4.59² =
  5. 5.49² =
  6. 6.21² =
  7. 7.79² =
  8. 8.49² =
  9. 9.71² =
  10. 10.41² =
  11. 11.91² =
  12. 12.69² =
  13. 13.69² =
  14. 14.31² =
  15. 15.41² =
  16. 16.21² =
  17. 17.31² =
  18. 18.21² =
  19. 19.19² =
  20. 20.61² =
  21. 21.21² =
  22. 22.51² =
  23. 23.91² =
  24. 24.39² =
  25. 25.79² =
  26. 26.29² =
  27. 27.61² =
  28. 28.29² =
  29. 29.41² =
  30. 30.71² =
  31. 31.21² =
  32. 32.79² =
  33. 33.31² =
  34. 34.31² =
  35. 35.59² =
  36. 36.41² =
  37. 37.41² =
  38. 38.79² =
  39. 39.61² =
  40. 40.79² =

Answer key

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

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