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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 250 · 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. 1.39² =
  2. 2.29² =
  3. 3.69² =
  4. 4.81² =
  5. 5.41² =
  6. 6.71² =
  7. 7.89² =
  8. 8.61² =
  9. 9.71² =
  10. 10.51² =
  11. 11.19² =
  12. 12.41² =
  13. 13.21² =
  14. 14.19² =
  15. 15.39² =
  16. 16.21² =
  17. 17.81² =
  18. 18.71² =
  19. 19.31² =
  20. 20.79² =
  21. 21.61² =
  22. 22.19² =
  23. 23.21² =
  24. 24.41² =
  25. 25.59² =
  26. 26.59² =
  27. 27.49² =
  28. 28.51² =
  29. 29.31² =
  30. 30.69² =
  31. 31.49² =
  32. 32.29² =
  33. 33.91² =
  34. 34.61² =
  35. 35.79² =
  36. 36.29² =
  37. 37.29² =
  38. 38.79² =
  39. 39.39² =
  40. 40.19² =

Answer key

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

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