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Level One > Number and Algebra

# Change Unknown

Keywords:
Achievement Objectives:

Specific Learning Outcomes:

Description of mathematics:

Number Framework Stage 4

Required Resource Materials:
Sets of counters.
Activity:

#### Using Materials

Problem: “A class is growing beans from bean seeds. When they leave school on
Monday, six seeds have sprouted. When they come to school on Tuesday morning, they find that eight seeds have sprouted altogether. How many seeds have sprouted
overnight?”
Discuss why the problem amounts to solving 6 + □ = 8. The students solve the
problem with counters and discuss their methods. Encourage the students to count on
by pointing at their fingers and saying “seven, eight, so the answer is two”.
Record 6 + 2 = 8 on the board or modelling book.
Examples: Word stories and recording for: 4 + □ = 6 5 + □ = 6 7 + □ = 8
7 + □ = 9 6 + □ = 8 6 + □ = 9

#### Using Imaging

Shielding and Imaging Only: Examples: Word stories and recording for: 12 + □ = 14
8 + □ = 10 12 + □ = 15 7 + □ = 11 8 + □ = 11 9 + □ = 12 ...

#### Using Number Properties

Examples: Word stories and recording for: 87 + □ = 89 43 + □ = 45
79 + □ = 83 51 + □ = 54 □ + 56 = 59 □ + 43 = 45 58 + □ = 63 ...

## Fly Flip

Solve addition problems to 20 by joining sets and counting all the objects.

## Ten Sweets Per Packet

Recall the facts up to 10, and the teen facts.