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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 338 · 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. 1.31² =
  2. 2.41² =
  3. 3.79² =
  4. 4.19² =
  5. 5.59² =
  6. 6.61² =
  7. 7.29² =
  8. 8.89² =
  9. 9.71² =
  10. 10.91² =
  11. 11.19² =
  12. 12.71² =
  13. 13.29² =
  14. 14.51² =
  15. 15.69² =
  16. 16.79² =
  17. 17.31² =
  18. 18.89² =
  19. 19.91² =
  20. 20.39² =
  21. 21.79² =
  22. 22.59² =
  23. 23.19² =
  24. 24.69² =
  25. 25.61² =
  26. 26.61² =
  27. 27.59² =
  28. 28.79² =
  29. 29.19² =
  30. 30.59² =
  31. 31.81² =
  32. 32.19² =
  33. 33.79² =
  34. 34.41² =
  35. 35.29² =
  36. 36.39² =
  37. 37.51² =
  38. 38.59² =
  39. 39.49² =
  40. 40.41² =

Answer key

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

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