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# Crossing the Five Barrier

Keywords:
Achievement Objectives:

Achievement Objective: NA1-1: Use a range of counting, grouping, and equal-sharing strategies with whole numbers and fractions.
AO elaboration and other teaching resources

Specific Learning Outcomes:

Solve addition problems to 20 by counting all the objects in their head.

Solve subtraction problems from 20 by counting all the objects in their head.

Description of mathematics:

Number Framework Stage 3

Required Resource Materials:
Counters
Blank card
Ten Frames (Material Master 4-6)
Activity:

#### Using Materials

Problem: Work out 3 + 4. Record 3 + 4 on the board. Show a tens frame pre-printed with 3 dots. Ask the students to point where 4 more counters would go and work out 3 + 4. Check by adding 4 counters. Record the answer.

Examples. Word stories and recording for: 3 + 3, 6 + 3, 2 +? = 6, 6 - ? = 2, 6 - 4, 4 +4, 8 -? = 4

#### Using Imaging Shielding:

Problem. Find 7 - ? = 4 Record 7 – ? = 4 on the board. Hide a pre-printed tens frame showing 7 dots and ask the students to picture what you can see. Then picture removing 3 dots. Let them draw in the air if this helps. Fold back if necessary by showing 7 dots and shielding 3 of the dots. Record the answer. Examples. Word stories and recording for: 3 +? = 7, ? + 4 = 8, 4 + ? = 9, ? + 2 = 8, 3 +4, 8 -2 …

#### Imaging Only:

Examples. Word stories and recording for: 2 + ? = 6, 8 - ? = 4 …

#### Challenging examples.

Problem: Angus has some money. He spends \$4. Now he has \$3. How much did he start with? Word stories and recording for: ? – 3 = 3, ? – 4 = 3, ? – 3 = 6, ? – 2 = 8 …