Problem Description:
The task involves solving two-digit subtraction problems with regrouping (borrowing). After solving each problem, the results are categorized into three groups based on their values:
-
< 50: Color the apple
Red
-
= 50: Color the apple
Yellow
-
> 50: Color the apple
Green
Solution Approach:
1. Solve each subtraction problem.
2. Determine whether the result is less than 50, equal to 50, or greater than 50.
3. Use the color key to assign the appropriate color to each apple.
Step-by-Step Solution:
#### First Row:
1.
56 - 23:
- Subtract: \( 56 - 23 = 33 \)
- Result:
33 < 50
- Color:
Red
2.
42 - 32:
- Subtract: \( 42 - 32 = 10 \)
- Result:
10 < 50
- Color:
Red
3.
77 - 12:
- Subtract: \( 77 - 12 = 65 \)
- Result:
65 > 50
- Color:
Green
4.
34 - 15:
- Subtract: \( 34 - 15 = 19 \)
- Result:
19 < 50
- Color:
Red
5.
45 - 40:
- Subtract: \( 45 - 40 = 5 \)
- Result:
5 < 50
- Color:
Red
#### Second Row:
1.
66 - 27:
- Subtract: \( 66 - 27 = 39 \)
- Result:
39 < 50
- Color:
Red
2.
89 - 10:
- Subtract: \( 89 - 10 = 79 \)
- Result:
79 > 50
- Color:
Green
3.
81 - 15:
- Subtract: \( 81 - 15 = 66 \)
- Result:
66 > 50
- Color:
Green
4.
94 - 78:
- Subtract: \( 94 - 78 = 16 \)
- Result:
16 < 50
- Color:
Red
5.
54 - 36:
- Subtract: \( 54 - 36 = 18 \)
- Result:
18 < 50
- Color:
Red
#### Third Row:
1.
33 - 29:
- Subtract: \( 33 - 29 = 4 \)
- Result:
4 < 50
- Color:
Red
2.
55 - 25:
- Subtract: \( 55 - 25 = 30 \)
- Result:
30 < 50
- Color:
Red
3.
76 - 44:
- Subtract: \( 76 - 44 = 32 \)
- Result:
32 < 50
- Color:
Red
4.
93 - 7:
- Subtract: \( 93 - 7 = 86 \)
- Result:
86 > 50
- Color:
Green
5.
67 - 32:
- Subtract: \( 67 - 32 = 35 \)
- Result:
35 < 50
- Color:
Red
#### Fourth Row:
1.
31 - 17:
- Subtract: \( 31 - 17 = 14 \)
- Result:
14 < 50
- Color:
Red
2.
66 - 25:
- Subtract: \( 66 - 25 = 41 \)
- Result:
41 < 50
- Color:
Red
3.
90 - 40:
- Subtract: \( 90 - 40 = 50 \)
- Result:
50 = 50
- Color:
Yellow
4.
43 - 15:
- Subtract: \( 43 - 15 = 28 \)
- Result:
28 < 50
- Color:
Red
5.
85 - 11:
- Subtract: \( 85 - 11 = 74 \)
- Result:
74 > 50
- Color:
Green
Final Answer:
Using the color key:
-
Red: Results less than 50
-
Yellow: Results equal to 50
-
Green: Results greater than 50
The colored apples are as follows:
```
Row 1: Red, Red, Green, Red, Red
Row 2: Red, Green, Green, Red, Red
Row 3: Red, Red, Red, Green, Red
Row 4: Red, Red, Yellow, Red, Green
```
Thus, the final answer is:
\boxed{\text{See the color assignments above.}}
Parent Tip: Review the logic above to help your child master the concept of addition and subtraction with regrouping worksheet 1st grade.
