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Adding equal groups
Joyful Mathematics: Chapter 11
GoalAdd equal groups to find how many there are altogether.
New words
group · things put togetherequal groups · groups with the same number in eachaltogether · all of them added together
Explanation
Sometimes every group has the same number. Look at 3 plates with 2 rotis on each plate. Add the groups: 2 + 2 + 2 = 6. There are 6 rotis altogether. Count each group once, then add.
Worked examples
An auto rickshaw has 3 wheels. 4 autos have 3 + 3 + 3 + 3 = 12 wheels.
Each vase holds 5 flowers. 3 vases hold 5 + 5 + 5 = 15 flowers.
Each box holds 2 sweets. 4 boxes hold 2 + 2 + 2 + 2 = 8 sweets.
Class activity
Pebble groups. Make 3 groups of 4 pebbles. Add the groups: 4 + 4 + 4. Check by counting all the pebbles one by one. Then make 5 groups of 2 pebbles and add them.
Practice
1
There are 3 groups with 3 bananas in each. How many bananas altogether?
9
2
4 bags have 2 books each. What is 2 + 2 + 2 + 2?
8
3
What is 5 + 5?
10
4
What is 2 + 2 + 2 + 2 + 2?
10
5
Each cow has 4 legs. How many legs do 2 cows have?
8