Page 146 - NUMINO TG_2A
P. 146
09Math Balance Unit
CMath Vo abulary missing addend: a number that is absent from addition facts
2 Use the number line to find the missing addend. 2. The second method for finding missing
addends is by using the number line.
12+ 7 =19 0 12 Students can count the number of spaces on
the number line to find the missing addend,
5 10 15 20 as shown in the example.
19
So, the missing addend is 7 . Finding the missing addend for 12 19
Start at 12 on the number line.
19 on the number line is where we stop.
Count from 12 to 19.
The number counted is the missing
a 9+ 12 =21 9 addend.
05
10 15 20 2c. When regrouping numbers, have students
21 keep in mind where the tens place is.
29 42
29 42
31 29 93 12 42
52 20 10 30
b 31+ 21 =52
29 13 42
c 13 +29=42 29
42
9. Math Balance 79
Problem: There are 4 cars in a parking lot. 7 buses and some trucks enter and make it 20 vehicles in total.
How many trucks come in to the parking lot? Use the number line.
Solution: 4 7 20, 11 20, 9
47
20
Answer: 9 trucks.
2A Unit 09 129
CMath Vo abulary missing addend: a number that is absent from addition facts
2 Use the number line to find the missing addend. 2. The second method for finding missing
addends is by using the number line.
12+ 7 =19 0 12 Students can count the number of spaces on
the number line to find the missing addend,
5 10 15 20 as shown in the example.
19
So, the missing addend is 7 . Finding the missing addend for 12 19
Start at 12 on the number line.
19 on the number line is where we stop.
Count from 12 to 19.
The number counted is the missing
a 9+ 12 =21 9 addend.
05
10 15 20 2c. When regrouping numbers, have students
21 keep in mind where the tens place is.
29 42
29 42
31 29 93 12 42
52 20 10 30
b 31+ 21 =52
29 13 42
c 13 +29=42 29
42
9. Math Balance 79
Problem: There are 4 cars in a parking lot. 7 buses and some trucks enter and make it 20 vehicles in total.
How many trucks come in to the parking lot? Use the number line.
Solution: 4 7 20, 11 20, 9
47
20
Answer: 9 trucks.
2A Unit 09 129
