1. the side of a square is 6.cm, correct to the nearest millimeter. Find the lower bound & the upper bound 2. Find the upper bound of 6.1 cm & 8.1 cm (it’s correct to 1 decimal place)

3. Sarah spends 5 minutes, correct to nearest minute, preparing one meal. She spends a total time of T minutes preparing 30 meals. Between what limits does T lie?

4. The distance between Singapore and Sydney is 6300 km correct to the nearest 100 km. A businessman travelled from Singapore to Sydney and then back to Singapore. He did this six times in a year. Between what limits is the total of distance he travelled?