สอบคณิต ป.4

$$671,890\ \approx\ 672,000$$

$$671,890\ \approx671,000$$

$$671,890\ \approx\ 600,000$$

$$78\ \approx\ 80$$  

$$78\approx\ 70$$  

$$78\approx\ 78$$  

$$456,789\ \approx\ 460,000$$

$$456,789\ \approx\ 450,000$$

$$456,789\ \approx\ 470,000$$

$$345,678\ \approx\ 350,000$$

$$345,678\ \approx\ 340,000$$

$$345,678\ \approx\ 330,000$$

$$987,654\ \approx\ 990,000$$

$$987,654\ \approx\ 980,000$$

$$987,654\ \approx\ 970,000$$

$$56\ \approx\ 60$$  

$$56\approx\ 50$$  

$$56\approx\ 56$$  

$$234,567\ \approx\ 235,000$$

$$234,567\ \approx\ 230,000$$

$$234,567\ \approx\ 240,000$$

$$345,678\ \approx\ 350,000$$

$$345,678\ \approx\ 340,000$$

$$345,678\ \approx\ 330,000$$

$$99\ \approx\ 100$$  

$$99\approx\ 90$$  

$$99\approx\ 99$$  

$$123,456\ \approx\ 123,000$$

$$123,456\ \approx\ 120,000$$

$$123,456\ \approx\ 125,000$$