This is aligned with the following California State Standards:
Combine two or more sets of objects to form a new set. Divide a set of 10 or fewer objects into two or more distinct subsets (e.g., dividing a set containing 10 objects into two subsets containing 4 and 6 objects).
Demonstrate understanding of addition by combining the objects of two or more sets, and demonstrate understanding of subtraction by removing some objects from a larger set.
Find the unknown sum (e.g., 5 + 8 = ?) or the missing addend (e.g., 6 + ? = 10) in an addition equation. Find the unknown difference in a subtraction equation (e.g., 12 - 7 = ?).
Solve word problems with numbers up to 100 using addition (e.g., Johnny has 25 suckers and buys 15 more; how many does he have now?) or subtraction (e.g., Johnny has 90 suckers and gives 20 away; how many does he have left?).
Solve two-step addition or subtraction word problems using an addition or subtraction strategy (e.g., Johnny has 25 suckers and buys 15 more, then he gives 10 to his brother; how many does he have now?).