← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 976 · 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. 1.79² =
  2. 2.59² =
  3. 3.61² =
  4. 4.49² =
  5. 5.39² =
  6. 6.59² =
  7. 7.91² =
  8. 8.79² =
  9. 9.39² =
  10. 10.91² =
  11. 11.31² =
  12. 12.29² =
  13. 13.69² =
  14. 14.51² =
  15. 15.71² =
  16. 16.71² =
  17. 17.49² =
  18. 18.19² =
  19. 19.41² =
  20. 20.61² =
  21. 21.41² =
  22. 22.51² =
  23. 23.19² =
  24. 24.19² =
  25. 25.49² =
  26. 26.39² =
  27. 27.21² =
  28. 28.71² =
  29. 29.81² =
  30. 30.69² =
  31. 31.51² =
  32. 32.41² =
  33. 33.61² =
  34. 34.79² =
  35. 35.79² =
  36. 36.19² =
  37. 37.61² =
  38. 38.21² =
  39. 39.59² =
  40. 40.61² =

Answer key

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

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