Joining addition problems represent a situation in which an initial whole-number quantity is increased by a known amount, so the total is found by combining the two quantities: start + change = result. The relationship can be represented with an equation, bar model, number line, or place-value strategy, including composing tens or hundreds, and distinguishes the total from the quantities being joined; multistep, fractional, decimal, and generalized algebraic cases are not included.
A joining addition problem starts with an amount and adds more to it.
Example:
Mia has 27 stickers. Her friend gives her 15 more stickers. How many stickers does Mia have now?
Find the starting amount: stickers.
Find the amount added: stickers.
Write an addition equation:
Add the ones: . Write ones and regroup ten.
Add the tens: tens.
The total is:
Mia has 42 stickers now. The total is the amount she started with plus the amount that was added.
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