Number (add/sub)
Hong Kong
Stage 1
Representation of add/sub using objects
Lesson
We can use objects to help us add and take away. The first thing we might need to do is count the number of objects we can see.
Objects that we are taking away will have a cross or a line through them.
We can count the objects to see how many we have after adding or taking away. Sometimes it's easier to count objects than to use a number line.
Examples
QUESTION 1
Which picture shows $2+1$2+1?
A
B
CD
QUESTION 2
Which pictures show $4+4$4+4? Choose all correct answers.
A
BC
QUESTION 3
Which picture shows $8-1$8−1?
A
B
C
D