Find the value of $67-39$67−39.
Find the value of $73-15$73−15.
Find the value of $74-48$74−48.
Find the value of $68-29$68−29.
Estimate and determine the sum or difference of two whole numbers
Create and solve single-step and multistep practical problems involving sums or differences of two whole numbers, each 9,999 or less