One and Two digit Addition and Subtraction - Perfect Math
... • Counting to 9 is great, but there are a lot more numbers than that. We use our ten digits to represent all these numbers. • When we see a two digit number we know that the first value is the tens place. This means instead of representing a value of one, it takes a value of ten. ...
... • Counting to 9 is great, but there are a lot more numbers than that. We use our ten digits to represent all these numbers. • When we see a two digit number we know that the first value is the tens place. This means instead of representing a value of one, it takes a value of ten. ...
( 10)( 15) x x N − + = x y 25 xy x y = + + 9 8 ×
... 2. Find the value of N so that the equation ( x − 10)( x + 15) = N has exactly one solution. 3. Find all integer pairs x and y, with x < y , such that xy = x + y + 25 . ...
... 2. Find the value of N so that the equation ( x − 10)( x + 15) = N has exactly one solution. 3. Find all integer pairs x and y, with x < y , such that xy = x + y + 25 . ...
