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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 183 · 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. 1.71² =
  2. 2.49² =
  3. 3.61² =
  4. 4.79² =
  5. 5.41² =
  6. 6.29² =
  7. 7.39² =
  8. 8.69² =
  9. 9.61² =
  10. 10.49² =
  11. 11.91² =
  12. 12.89² =
  13. 13.59² =
  14. 14.31² =
  15. 15.31² =
  16. 16.79² =
  17. 17.31² =
  18. 18.49² =
  19. 19.41² =
  20. 20.21² =
  21. 21.71² =
  22. 22.59² =
  23. 23.59² =
  24. 24.39² =
  25. 25.51² =
  26. 26.71² =
  27. 27.61² =
  28. 28.89² =
  29. 29.81² =
  30. 30.41² =
  31. 31.89² =
  32. 32.79² =
  33. 33.61² =
  34. 34.91² =
  35. 35.19² =
  36. 36.19² =
  37. 37.79² =
  38. 38.51² =
  39. 39.29² =
  40. 40.79² =

Answer key

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

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