Question

break apart addends as tens and ones
break apart the addends to find the sum.

1. 18 + 21 =

1. 33

+ 49

problem solving real world
choose a way to solve.
write or draw to explain.

1. vicente has 28 baseball cards. justin has 18 baseball cards. how many baseball cards do they have together?

1. write math explain how to break apart the addends to find the sum of 25 + 16.

Explanation:

Step1: Break 18 and 21 into tens and ones for 18 + 21

$18=10 + 8$, $21=20+1$

Step2: Add the tens and ones separately

$(10 + 20)+(8 + 1)=30+9$

Step3: Calculate the final sum

$30+9 = 39$

For 2.

Break 33 and 49 into tens and ones:
$33=30 + 3$, $49=40+9$
Then $(30+40)+(3 + 9)=70+12=82$

For 3.

Step1: Identify the number of cards each has

Vicente has 28 cards and Justin has 18 cards.

Step2: Add the number of cards

$28+18$
Break 28 into $20 + 8$ and 18 into $10+8$
$(20 + 10)+(8 + 8)=30+16=46$

For 4.

Break 25 into $20+5$ and 16 into $10 + 6$.
First, add the tens: $20+10 = 30$.
Then, add the ones: $5+6=11$.
Finally, add the results of adding tens and ones: $30+11 = 41$.

Answer:

1. 39
2. $33 = 30+3$, $49=40 + 9$, $(30 + 40)+(3+9)=82$
3. 46
4. Break 25 into 20 and 5, 16 into 10 and 6. Add tens (20 + 10 = 30) and ones (5+6 = 11), then sum them (30+11 = 41).