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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 24 · 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. 1.81² =
  2. 2.29² =
  3. 3.71² =
  4. 4.61² =
  5. 5.59² =
  6. 6.39² =
  7. 7.79² =
  8. 8.19² =
  9. 9.21² =
  10. 10.19² =
  11. 11.21² =
  12. 12.29² =
  13. 13.21² =
  14. 14.81² =
  15. 15.59² =
  16. 16.69² =
  17. 17.79² =
  18. 18.71² =
  19. 19.19² =
  20. 20.19² =
  21. 21.81² =
  22. 22.21² =
  23. 23.39² =
  24. 24.91² =
  25. 25.81² =
  26. 26.61² =
  27. 27.79² =
  28. 28.91² =
  29. 29.39² =
  30. 30.41² =
  31. 31.19² =
  32. 32.81² =
  33. 33.91² =
  34. 34.29² =
  35. 35.79² =
  36. 36.69² =
  37. 37.81² =
  38. 38.79² =
  39. 39.41² =
  40. 40.21² =

Answer key

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

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