Page 8 - Genius PBD - Mathematics Year 1

Date:
UNIT 2 Addition and Subtraction
Learning Area: Numbers and Operations

Genius Notes How many marbles are there if 2 marbles are
add up into the container?

1. Vocabulary for addition operations include:
add total put altogether sum

5 add 1 make 6

How many marbles?
5 marbles and 1 marble make 6 marbles altogether.

How many marbles ltogether?
5 and 1 make 6

Number sentence: 5 + 1 = 6

2. Addition operation.
Step  Step  Step 
Arrange digits according Add digits to the place Add digits to the tens place
to place value value sa value. Reassemble if necessary.

3. Vocabulary for subtraction operations include:
left minus take away difference balance

Take away 2 from 5. 3 left.

How many marbles are left?
There 5 marbles. Take away 2 marbles make 3 marbles left.

The difference in the number of marbles
before and after taken out is 2 marbles.

Number sentence: 5 – 2 = 3
4. Subtraction operation.

Step  Step  Step 
Arrange digits according Subtract the digit at Subtract the digit at the tens place
to place value the place value sa value. Reassemble if necessary.

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