Question

2.138 + 0.003 = \boxed{\space} \
1.807 + 0.02 = 1.827 \
1.807 - 0.02 = 1.787 \
2.138 - 0.003 = 312

Explanation:

Step1: Align decimal points

$$2.1380 + 0.0003$$

Step2: Add the numbers

$$2.138 + 0.0003 = 2.1383$$

Answer:

2.1383