 ## Rounding and Estimates

– Rounding and estimating are math strategies used for approximating a number.
– To estimate means to make a rough guess or calculation.
– To round means to simplify a known number by scaling it slightly up or down.

Example:
$$\ 73\ + \ 69\ \cong \color{red}{140}$$

##### Rounding and Estimates - Example 1:
$$36 \ \times \ 59\ \cong \color{red}{2400}$$
##### Rounding and Estimates - Example 2:
$$29 \ \times \ 72\ \cong \color{red}{2100}$$
##### Rounding and Estimates - Example 3:
$$51 \ \times \ 70\ \cong \color{red}{3500}$$
##### Rounding and Estimates - Example 4:
$$58 \ \times \ 26\ \cong \color{red}{1800}$$
##### Rounding and Estimates - Example 5:
$$73 \ \times \ 50\ \cong \color{red}{3500}$$
##### Rounding and Estimates - Example 6:
$$80 \ \times \ 83\ \cong \color{red}{6400}$$
##### Rounding and Estimates - Example 7:
$$95 \ \times \ 30\ \cong \color{red}{3000}$$
##### Rounding and Estimates - Example 8:
$$25 \ + \ 66\ \cong \color{red}{90}$$
##### Rounding and Estimates - Example 9:
$$32 \ + \ 41\ \cong \color{red}{70}$$
##### Rounding and Estimates - Example 10:
$$47 \ + \ 83\ \cong \color{red}{130}$$
##### Rounding and Estimates - Example 11:

$$87 \ - \ 39\ \cong \color{red}{50}$$

##### Rounding and Estimates - Example 12:

$$272 \ - \ 157\ \cong \color{red}{110}$$

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