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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 99 · 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. 1.51² =
  2. 2.69² =
  3. 3.41² =
  4. 4.79² =
  5. 5.69² =
  6. 6.49² =
  7. 7.41² =
  8. 8.29² =
  9. 9.29² =
  10. 10.39² =
  11. 11.49² =
  12. 12.29² =
  13. 13.41² =
  14. 14.41² =
  15. 15.39² =
  16. 16.51² =
  17. 17.61² =
  18. 18.49² =
  19. 19.91² =
  20. 20.89² =
  21. 21.19² =
  22. 22.41² =
  23. 23.19² =
  24. 24.91² =
  25. 25.31² =
  26. 26.61² =
  27. 27.29² =
  28. 28.19² =
  29. 29.19² =
  30. 30.61² =
  31. 31.29² =
  32. 32.19² =
  33. 33.79² =
  34. 34.79² =
  35. 35.59² =
  36. 36.69² =
  37. 37.89² =
  38. 38.71² =
  39. 39.31² =
  40. 40.41² =

Answer key

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

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