1.N.5.f
Solve authentic problems involving addition and subtraction within 20 in situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all parts of the addition or subtraction problem by using objects, drawings, and/or equations with a symbol for the unknown number to represent the problem.
Example Problems
Jack is collecting marbles. Jack has marbles, and his friend has 12 marbles. All together, they have 31 marbles.
Write and solve an equation that describes the situation in order to find out how many marbles Jack has.
Write and solve an equation that describes the situation in order to find out how many marbles Jack has.
A team is organizing a science fair. They buy sets of sample containers, with 9 containers in each set. All together, they have 63 containers for the fair.
Write and solve an equation that describes the situation in order to find out how many sets of containers they bought.
Write and solve an equation that describes the situation in order to find out how many sets of containers they bought.
A family is assembling craft kits for an arts workshop. They buy boxes, each containing 12 craft items. Altogether, they have 120 craft items to use.
Write and solve an equation that describes the situation in order to find out how many boxes they bought.
Write and solve an equation that describes the situation in order to find out how many boxes they bought.

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