Problem Analysis and Solution
The worksheet focuses on adding single digits to two-digit numbers without regrouping. Let's solve each section step by step.
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Section A: Use the base 10 blocks to complete the additions
Base 10 blocks are visual aids where:
- Green rods represent tens (10 each).
- Yellow cubes represent ones (1 each).
We need to count the total number of rods and cubes for each addition problem.
1.
24 + 3
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24: 2 green rods (20) + 4 yellow cubes (4)
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+3: 3 yellow cubes
- Total: 2 green rods (20) + 7 yellow cubes (7)
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Answer: 27
2.
33 + 6
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33: 3 green rods (30) + 3 yellow cubes (3)
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+6: 6 yellow cubes
- Total: 3 green rods (30) + 9 yellow cubes (9)
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Answer: 39
3.
15 + 3
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15: 1 green rod (10) + 5 yellow cubes (5)
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+3: 3 yellow cubes
- Total: 1 green rod (10) + 8 yellow cubes (8)
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Answer: 18
4.
61 + 5
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61: 6 green rods (60) + 1 yellow cube (1)
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+5: 5 yellow cubes
- Total: 6 green rods (60) + 6 yellow cubes (6)
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Answer: 66
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Section B: Addition Wheels
In each wheel, add the central number to each number outside the wheel.
1.
Central Number: +4
- 45 + 4 = 49
- 73 + 4 = 77
- 21 + 4 = 25
- 80 + 4 = 84
- 31 + 4 = 35
- 54 + 4 = 58
- 12 + 4 = 16
- 65 + 4 = 69
2.
Central Number: +22
- 4 + 22 = 26
- 0 + 22 = 22
- 6 + 22 = 28
- 3 + 22 = 25
- 7 + 22 = 29
- 1 + 22 = 23
- 5 + 22 = 27
- 2 + 22 = 24
3.
Central Number: +7
- 60 + 7 = 67
- 41 + 7 = 48
- 32 + 7 = 39
- 11 + 7 = 18
- 92 + 7 = 99
- 81 + 7 = 88
- 50 + 7 = 57
- 72 + 7 = 79
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Section C: Fill in the blanks to complete the addition problems
Perform each addition as shown:
1.
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40 + 9 = 49
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13 + 3 = 16
2.
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7 + 90 = 97
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68 + 1 = 69
3.
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72 + 7 = 79
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23 + 2 = 25
4.
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56 + 1 = 57
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95 + 2 = 97
5.
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4 + 84 = 88
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51 + 7 = 58
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Final Answers
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Section A
1. \( 24 + 3 = \boxed{27} \)
2. \( 33 + 6 = \boxed{39} \)
3. \( 15 + 3 = \boxed{18} \)
4. \( 61 + 5 = \boxed{66} \)
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Section B
1. Wheel (+4): 49, 77, 25, 84, 35, 58, 16, 69
2. Wheel (+22): 26, 22, 28, 25, 29, 23, 27, 24
3. Wheel (+7): 67, 48, 39, 18, 99, 88, 57, 79
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Section C
1. 49, 16
2. 97, 69
3. 79, 25
4. 57, 97
5. 88, 58
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Final Boxed Answers:
\[
\boxed{27, 39, 18, 66}
\]
Parent Tip: Review the logic above to help your child master the concept of adding two digit numbers without regrouping worksheet.
