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Adding Angles & Finding Missing Angles — Easy Worksheet 1
Grade 4 · MathSheets Name: ____________________ Date: __________
Find each angle measure in degrees. The pictures are not drawn to scale.
How to solve
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Example
∠ABD = 40° and ∠DBC = 60°. What is the measure of ∠ABC?
Answer: 100
✓ Correct!
Not quite. The answer is
💡 How to solve: Adding Angles & Finding Missing Angles
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Try a similar one
∠ABD = 50° and ∠DBC = 50°. What is the measure of ∠ABC?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Adding Angles & Finding Missing Angles
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Try a similar one
∠ABD = 50° and ∠DBC = 20°. What is the measure of ∠ABC?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Adding Angles & Finding Missing Angles
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Try a similar one
∠ABD = 90° and ∠DBC = 60°. What is the measure of ∠ABC?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Adding Angles & Finding Missing Angles
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Try a similar one
∠ABD = 60° and ∠DBC = 80°. What is the measure of ∠ABC?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Adding Angles & Finding Missing Angles
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Try a similar one
∠ABD = 80° and ∠DBC = 70°. What is the measure of ∠ABC?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Adding Angles & Finding Missing Angles
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Try a similar one
∠ABD = 60° and ∠DBC = 30°. What is the measure of ∠ABC?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Adding Angles & Finding Missing Angles
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Try a similar one
∠ABD = 50° and ∠DBC = 100°. What is the measure of ∠ABC?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
✓ Correct!
Not quite. The answer is
💡 How to solve: Adding Angles & Finding Missing Angles
When an angle is split into two smaller angles, the parts add up to the whole: 35° + 50° = 85°. To find a missing part, subtract the known part from the whole. A right angle is 90° and a straight angle is 180°, so the missing part is 90 − the known part or 180 − the known part.
Try a similar one
∠ABD = 20° and ∠DBC = 40°. What is the measure of ∠ABC?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Adding Angles & Finding Missing Angles — Easy Worksheet 1
Find each angle measure in degrees. The pictures are not drawn to scale.