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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 163 · 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. 1.49² =
  2. 2.79² =
  3. 3.59² =
  4. 4.59² =
  5. 5.49² =
  6. 6.89² =
  7. 7.71² =
  8. 8.59² =
  9. 9.61² =
  10. 10.61² =
  11. 11.41² =
  12. 12.21² =
  13. 13.41² =
  14. 14.71² =
  15. 15.71² =
  16. 16.81² =
  17. 17.79² =
  18. 18.81² =
  19. 19.41² =
  20. 20.79² =
  21. 21.31² =
  22. 22.31² =
  23. 23.39² =
  24. 24.21² =
  25. 25.91² =
  26. 26.51² =
  27. 27.21² =
  28. 28.59² =
  29. 29.71² =
  30. 30.91² =
  31. 31.41² =
  32. 32.49² =
  33. 33.79² =
  34. 34.69² =
  35. 35.39² =
  36. 36.41² =
  37. 37.29² =
  38. 38.39² =
  39. 39.89² =
  40. 40.71² =

Answer key

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

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