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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 120 · 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. 1.69² =
  2. 2.49² =
  3. 3.61² =
  4. 4.91² =
  5. 5.41² =
  6. 6.19² =
  7. 7.19² =
  8. 8.19² =
  9. 9.79² =
  10. 10.19² =
  11. 11.81² =
  12. 12.81² =
  13. 13.21² =
  14. 14.61² =
  15. 15.39² =
  16. 16.51² =
  17. 17.79² =
  18. 18.41² =
  19. 19.81² =
  20. 20.79² =
  21. 21.19² =
  22. 22.61² =
  23. 23.71² =
  24. 24.29² =
  25. 25.89² =
  26. 26.29² =
  27. 27.39² =
  28. 28.21² =
  29. 29.59² =
  30. 30.19² =
  31. 31.79² =
  32. 32.71² =
  33. 33.71² =
  34. 34.41² =
  35. 35.39² =
  36. 36.19² =
  37. 37.49² =
  38. 38.29² =
  39. 39.69² =
  40. 40.39² =

Answer key

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

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