Estimations – Solving Master

Round up
1. $12345 \approx 12350$ (rounding up to 4 sig. fig.)
2. $12345 \approx 12400$ (rounding up to 3 sig. fig.)
3. $1.2345 \approx 1.3$ (rounding up to 2 sig. fig.)
Round down
1. $12345 \approx 12340$ (rounding down to 4 sig. fig.)
2. $12345 \approx 12300$ (rounding down to 3 sig. fig.)
3. $1.2345 \approx 1.0$ (rounding down to 2 sig. fig.)
Round off
1. $12345 \approx 12340$ (rounding off to 4 sig. fig.)
2. $12345 \approx 12300$ (rounding off to 3 sig. fig.)
3. $1.2345 \approx 1.0$ (rounding off to 2 sig. fig.)