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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 383 · 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. 1.29² =
  2. 2.59² =
  3. 3.79² =
  4. 4.69² =
  5. 5.61² =
  6. 6.41² =
  7. 7.19² =
  8. 8.79² =
  9. 9.41² =
  10. 10.31² =
  11. 11.61² =
  12. 12.59² =
  13. 13.21² =
  14. 14.51² =
  15. 15.59² =
  16. 16.29² =
  17. 17.59² =
  18. 18.61² =
  19. 19.21² =
  20. 20.29² =
  21. 21.19² =
  22. 22.59² =
  23. 23.31² =
  24. 24.79² =
  25. 25.91² =
  26. 26.19² =
  27. 27.19² =
  28. 28.41² =
  29. 29.69² =
  30. 30.41² =
  31. 31.39² =
  32. 32.69² =
  33. 33.59² =
  34. 34.49² =
  35. 35.69² =
  36. 36.89² =
  37. 37.69² =
  38. 38.19² =
  39. 39.29² =
  40. 40.71² =

Answer key

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

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