Final answer:
The least amount Chantal must still save to buy her new running shoes is $23, which is the difference between the total cost of the shoes and the amount she has already saved.
Step-by-step explanation:
Chantal would like to buy a new pair of running shoes which cost $85. Since she has saved $62, we need to calculate the remaining amount she needs to save. To do this, we subtract what she has saved from the total cost of the shoes:
$85 (total cost) - $62 (amount saved) = $23 (amount still needed).
Therefore, the least amount Chantal must still save is $23.