← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 56 · 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. 2.21² =
  3. 3.71² =
  4. 4.61² =
  5. 5.41² =
  6. 6.51² =
  7. 7.79² =
  8. 8.91² =
  9. 9.31² =
  10. 10.51² =
  11. 11.79² =
  12. 12.69² =
  13. 13.71² =
  14. 14.21² =
  15. 15.69² =
  16. 16.71² =
  17. 17.51² =
  18. 18.69² =
  19. 19.29² =
  20. 20.29² =
  21. 21.89² =
  22. 22.31² =
  23. 23.29² =
  24. 24.19² =
  25. 25.69² =
  26. 26.41² =
  27. 27.79² =
  28. 28.21² =
  29. 29.79² =
  30. 30.39² =
  31. 31.81² =
  32. 32.61² =
  33. 33.81² =
  34. 34.19² =
  35. 35.31² =
  36. 36.71² =
  37. 37.41² =
  38. 38.69² =
  39. 39.79² =
  40. 40.89² =

Answer key

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

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths