What is square root of 28 approximated to the nearest tenth?

√28    use your calculator

≈ 5.2915

The tenth digit is 2, and the digit after the 2 is 9. 9 is more than 5, so we round up the 2 to 3.

≈ 5.3   to the nearest tenth. 

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post