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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 139 · 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. 1.31² =
  2. 2.29² =
  3. 3.49² =
  4. 4.91² =
  5. 5.21² =
  6. 6.91² =
  7. 7.59² =
  8. 8.31² =
  9. 9.29² =
  10. 10.51² =
  11. 11.91² =
  12. 12.21² =
  13. 13.61² =
  14. 14.29² =
  15. 15.61² =
  16. 16.61² =
  17. 17.51² =
  18. 18.79² =
  19. 19.71² =
  20. 20.59² =
  21. 21.49² =
  22. 22.29² =
  23. 23.79² =
  24. 24.79² =
  25. 25.19² =
  26. 26.29² =
  27. 27.19² =
  28. 28.51² =
  29. 29.69² =
  30. 30.81² =
  31. 31.39² =
  32. 32.31² =
  33. 33.31² =
  34. 34.41² =
  35. 35.41² =
  36. 36.61² =
  37. 37.39² =
  38. 38.21² =
  39. 39.49² =
  40. 40.61² =

Answer key

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

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