Solve the following addition and subtraction problems. a. 90 cg 95 mg + 7g 12 cg 18 mg b. 4 kg 2hg + 14 kg + 5 kg 17 hg c. 12 dag 5 g - 7 g d. 8 kg - 9 hg

a. 90 cg 95 mg + 7g 12 cg 18 mg

Step 1: Convert measurements so that all has same unit. I'll use mg:

1 cg = 10mg; 1g = 1000 mg; Therefore:

90cg = 900mg; 7g = 7,000 mg; 12cg = 120mg

Step 2: Add

900mg + 95mg + 7,000mg + 120mg + 18mg = 8,133mg

b. 4 kg 2hg + 14 kg + 5 kg 17 hg

Step 1: Convert measurements so that all has same unit. I'll use kg:

1hg =.1kg; Therefore:

2hg =.2kg; 17hg = 1.7

Step 2: Add

4kg +.2kg + 14kg + 5kg + 1.7kg = 24.9kg

c. 12 dag 5 g - 7 g

Step 1: Convert measurements so that all has same unit. I'll use g:

1 dag = 10g; Therefore:

12dag = 120g

Step 2: Subtract

120g - 5g - 7g = 108g

d. 8 kg - 9 hg

Step 1: Convert measurements so that all has same unit. I'll use kg:

1hg =.1kg; Therefore:

9hg =.9kg

Step 2: Subtract

8kg -.9kg = 7.1kg