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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 140 · 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. 2.51² =
  3. 3.29² =
  4. 4.31² =
  5. 5.41² =
  6. 6.89² =
  7. 7.61² =
  8. 8.79² =
  9. 9.39² =
  10. 10.81² =
  11. 11.91² =
  12. 12.21² =
  13. 13.41² =
  14. 14.19² =
  15. 15.19² =
  16. 16.69² =
  17. 17.91² =
  18. 18.79² =
  19. 19.39² =
  20. 20.71² =
  21. 21.59² =
  22. 22.39² =
  23. 23.49² =
  24. 24.31² =
  25. 25.41² =
  26. 26.71² =
  27. 27.59² =
  28. 28.41² =
  29. 29.61² =
  30. 30.31² =
  31. 31.79² =
  32. 32.59² =
  33. 33.51² =
  34. 34.41² =
  35. 35.21² =
  36. 36.19² =
  37. 37.59² =
  38. 38.71² =
  39. 39.49² =
  40. 40.61² =

Answer key

  1. 2601
  2. 2601
  3. 841
  4. 961
  5. 1681
  6. 7921
  7. 3721
  8. 6241
  9. 1521
  10. 6561
  11. 8281
  12. 441
  13. 1681
  14. 361
  15. 361
  16. 4761
  17. 8281
  18. 6241
  19. 1521
  20. 5041
  21. 3481
  22. 1521
  23. 2401
  24. 961
  25. 1681
  26. 5041
  27. 3481
  28. 1681
  29. 3721
  30. 961
  31. 6241
  32. 3481
  33. 2601
  34. 1681
  35. 441
  36. 361
  37. 3481
  38. 5041
  39. 2401
  40. 3721

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