Find $1.007+0.1$1.007+0.1 giving your answer as a decimal.

Find $1.009+0.01$1.009+0.01 giving your answer as a decimal.

Find $4.02+0.001$4.02+0.001 giving your answer as a decimal.

Find $2.5+0.001$2.5+0.001 giving your answer as a decimal.