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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 145 · 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. 1.59² =
  2. 2.31² =
  3. 3.31² =
  4. 4.31² =
  5. 5.69² =
  6. 6.19² =
  7. 7.41² =
  8. 8.49² =
  9. 9.71² =
  10. 10.19² =
  11. 11.49² =
  12. 12.51² =
  13. 13.71² =
  14. 14.51² =
  15. 15.51² =
  16. 16.31² =
  17. 17.49² =
  18. 18.21² =
  19. 19.39² =
  20. 20.41² =
  21. 21.79² =
  22. 22.29² =
  23. 23.91² =
  24. 24.91² =
  25. 25.69² =
  26. 26.91² =
  27. 27.21² =
  28. 28.79² =
  29. 29.21² =
  30. 30.71² =
  31. 31.69² =
  32. 32.79² =
  33. 33.21² =
  34. 34.79² =
  35. 35.21² =
  36. 36.91² =
  37. 37.19² =
  38. 38.91² =
  39. 39.29² =
  40. 40.61² =

Answer key

  1. 3481
  2. 961
  3. 961
  4. 961
  5. 4761
  6. 361
  7. 1681
  8. 2401
  9. 5041
  10. 361
  11. 2401
  12. 2601
  13. 5041
  14. 2601
  15. 2601
  16. 961
  17. 2401
  18. 441
  19. 1521
  20. 1681
  21. 6241
  22. 841
  23. 8281
  24. 8281
  25. 4761
  26. 8281
  27. 441
  28. 6241
  29. 441
  30. 5041
  31. 4761
  32. 6241
  33. 441
  34. 6241
  35. 441
  36. 8281
  37. 361
  38. 8281
  39. 841
  40. 3721

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