Question

a. 10.3 + 3.7
b. 20.99 − 4.97
c. 15.99 + 23.51
d. 1.893 − 0.353

Explanation:

Part a

Step1: Add the decimal numbers

To add \(10.3\) and \(3.7\), we align the decimal points and add the digits in each place value.
\[10.3 + 3.7 = (10 + 0.3)+(3 + 0.7)= (10 + 3)+(0.3 + 0.7)= 13 + 1 = 14\]

Step1: Subtract the decimal numbers

To subtract \(4.97\) from \(20.99\), we align the decimal points and subtract the digits in each place value.
\[20.99-4.97=(20 + 0.99)-(4 + 0.97)=(20 - 4)+(0.99 - 0.97)=16+0.02 = 16.02\]

Step1: Add the decimal numbers

To add \(15.99\) and \(23.51\), we align the decimal points and add the digits in each place value.
\[15.99+23.51=(15 + 0.99)+(23 + 0.51)=(15+23)+(0.99 + 0.51)=38 + 1.5=39.5\]

Answer:

\(14\)

Part b