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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 321 · 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. 1.41² =
  2. 2.51² =
  3. 3.51² =
  4. 4.51² =
  5. 5.59² =
  6. 6.69² =
  7. 7.21² =
  8. 8.71² =
  9. 9.39² =
  10. 10.71² =
  11. 11.79² =
  12. 12.59² =
  13. 13.51² =
  14. 14.91² =
  15. 15.89² =
  16. 16.29² =
  17. 17.51² =
  18. 18.51² =
  19. 19.29² =
  20. 20.91² =
  21. 21.91² =
  22. 22.81² =
  23. 23.81² =
  24. 24.19² =
  25. 25.51² =
  26. 26.59² =
  27. 27.19² =
  28. 28.59² =
  29. 29.61² =
  30. 30.89² =
  31. 31.19² =
  32. 32.79² =
  33. 33.19² =
  34. 34.71² =
  35. 35.79² =
  36. 36.71² =
  37. 37.39² =
  38. 38.19² =
  39. 39.79² =
  40. 40.81² =

Answer key

  1. 1681
  2. 2601
  3. 2601
  4. 2601
  5. 3481
  6. 4761
  7. 441
  8. 5041
  9. 1521
  10. 5041
  11. 6241
  12. 3481
  13. 2601
  14. 8281
  15. 7921
  16. 841
  17. 2601
  18. 2601
  19. 841
  20. 8281
  21. 8281
  22. 6561
  23. 6561
  24. 361
  25. 2601
  26. 3481
  27. 361
  28. 3481
  29. 3721
  30. 7921
  31. 361
  32. 6241
  33. 361
  34. 5041
  35. 6241
  36. 5041
  37. 1521
  38. 361
  39. 6241
  40. 6561

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