Rad the following problem solving situations. Be ready to share your solutions and thinking!
a) Linda has 70 sparkly rocks in her collection. Kevin gave her 8 more sparkly rocks. How many sparkly rocks does Linda have? Draw a picture on your paper to model your solution and record your answer with a number sentence.
b) The first grade class is playing a game of softball outside. There are 2 teams of 10 children and 2 extra children to be umpires. How many children are in the 1st grade class? Draw a picture on your paper to model your solution and record your answer with a number sentence.
The student must be able to add 10,
20, 30, 40, 50, 60, 70, 80, or 90 and 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 using
concrete models such as base-ten models,
place value disks, linking cubes, and pictorial models such as base-ten pictorials, place value disks, open number lines,
and strip diagrams. They must be efficient in modeling their
sums, explaining their addition strategies, and recording their number sentences.
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