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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 74 · 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. 1.91² =
  2. 2.29² =
  3. 3.19² =
  4. 4.19² =
  5. 5.51² =
  6. 6.29² =
  7. 7.51² =
  8. 8.59² =
  9. 9.39² =
  10. 10.51² =
  11. 11.91² =
  12. 12.61² =
  13. 13.39² =
  14. 14.59² =
  15. 15.51² =
  16. 16.81² =
  17. 17.19² =
  18. 18.71² =
  19. 19.39² =
  20. 20.71² =
  21. 21.59² =
  22. 22.89² =
  23. 23.81² =
  24. 24.49² =
  25. 25.79² =
  26. 26.41² =
  27. 27.19² =
  28. 28.79² =
  29. 29.29² =
  30. 30.39² =
  31. 31.79² =
  32. 32.39² =
  33. 33.79² =
  34. 34.91² =
  35. 35.49² =
  36. 36.59² =
  37. 37.71² =
  38. 38.19² =
  39. 39.61² =
  40. 40.81² =

Answer key

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

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