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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 815 · 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. 1.19² =
  2. 2.79² =
  3. 3.29² =
  4. 4.51² =
  5. 5.89² =
  6. 6.81² =
  7. 7.19² =
  8. 8.89² =
  9. 9.79² =
  10. 10.79² =
  11. 11.59² =
  12. 12.21² =
  13. 13.21² =
  14. 14.59² =
  15. 15.71² =
  16. 16.59² =
  17. 17.59² =
  18. 18.31² =
  19. 19.41² =
  20. 20.89² =
  21. 21.79² =
  22. 22.89² =
  23. 23.91² =
  24. 24.41² =
  25. 25.51² =
  26. 26.19² =
  27. 27.19² =
  28. 28.21² =
  29. 29.19² =
  30. 30.89² =
  31. 31.29² =
  32. 32.79² =
  33. 33.31² =
  34. 34.79² =
  35. 35.59² =
  36. 36.91² =
  37. 37.91² =
  38. 38.41² =
  39. 39.19² =
  40. 40.79² =

Answer key

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

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