Maths Problem Solving

This is my maths problem solving for week seven, If you used these same stratagies, feel free to commet and share them with me I would love to see it!

1. $61 - $43 = $18           -$3  -$3     $58 - $40 = $18	1. $61 - $43 = $18       $43 = $40 + $3      $61 - $40 = $21                     $21 - $3 = $18
2. $83 - $48 = $35         +$2  +$2   $85 -  $50 = $35	2. $83 - $48 = $35                                                            -$8 -$8      $75 -  $40 = $35
3.$182 - $145= $37 $145 + $37 = $182 $145 + $30 = $175 $175 + $7 = $182  $30 + $7 = $37	3.$182 - $145= $37 $145 = $100 + $40 + $5 $182 - $100 = $82 $82 - $40 = $42 $42 - $5 = $37
4.$202 - $175= $27   +$25   +$25  $227 - $200 = $27	4.$202 - $175= $27               +$25   $202 - $200 = $2   $2 + $25 = $27