Adding with Base Ten Blocks
2NBT5
43 + 30 = ?
Let’s use base ten blocks to build this problem!
Ty has 43 Legos and Jessie has 30 Legos. How many do they have in all?
Ty has 43 Legos and Jessie has 30 Legos. How many do they have in all?
We can place 4 tens and 3 ones for the first addend.
Then we can place 3 tens and 0 ones for the second addend.
Ty has 43 Legos and Jessie has 30 Legos. How many do they have in all?
Notice there aren’t any ones in the second addend, so in the sum there will be the same amount of ones as there are in the first addend.
The ones don’t change!
Ty has 43 Legos and Jessie has 30 Legos. How many do they have in all?
The sum is 77.
43 + 30 = 77.
27 + 52 = ?
Ty has 27 Legos and Jessie has 52 Legos. How many do they have in all?
Let’s practice with some more problems!
63 + 37 = ?
Ty has 63 Legos and Jessie has 37 Legos. How many do they have in all?
Let’s practice with some more problems!
78 + 18 = ?
Ty has 78 Legos and Jessie has 18 Legos. How many do they have in all?
Let’s practice with some more problems!
60 + 19 = ?
Ty has 60 Legos and Jessie has 19 Legos. How many do they have in all?
Let’s practice with some more problems!
43 + 30 = ?
How can we use our representation to solve the equation?
Let’s look at the base ten block model for this equation.
43 + 30 = ?
From Building to Drawing
How could we represent this problem in a drawing?
43 + 30 = 73
From Building to Drawing
How could we represent this problem in a drawing?
43 + 30 = 73
60 + 19 = ____
Draw models of these problems and write the sum.
27 + 22 = _____
Draw to represent and then write the sum.
35 + 47 = _____
Draw to represent and then write the sum.
56 + 28 = _____
Draw to represent and then write the sum.
Talk with a partner about
how to add 42 + 23 = _____.
What could you draw to
represent the problem?
Turn and Talk!