600+300= 52+36= 60+40= 14÷2= 54÷6=

480+200= 8×3= 9000-3000= 1200-400=

600+800= 6×3= 150-70= 50+60= 8×7=

fill (up) a vacancy

1.4kg = () g 7000g = () kg

6000 g = () kg 3 kg = () g.

2. Fill in the appropriate weight unit.

A ping-pong ball weighs 3 () and a bag of washing powder weighs 1 ().

A toothpaste weighs 100 () and a rooster weighs 2 ().

A child weighs 23 () and a naughty schoolbag weighs about 3 ().

Three. Judging whether it is true or not (mark "√" correctly and "X" wrongly)

1 and 1 kg iron ratio1000g cotton weight. ( )

2. 1 Skipping rope is 5 kg long. ( )

A volleyball weighs 400kg. ( )

6. Mom's height 162 cm and weight 53 grams. ( )

Fourth, solve the problem.

1, a bottle of peanut oil weighs 6 kg, and aunt in the dining hall bought 8 bottles. How much does a * * * weigh?

The fruit shop brought grapes and oranges. Grapes weigh 9 kilograms, and oranges weigh three times as much as grapes. How many kilograms of grapes and oranges are there