• ### Where are they now?

Uses concrete materials where some items are concealed to solve addition problems to 20 using counting on strategies or part-part-whole knowledge

Poses and solves simple addition problems

• ### Where to next?

Uses count on from larger (add 1, 2 or 3) or part-part-whole knowledge to mentally add small collections to one and two digit numbers

• ### Where are they now?

Uses concrete materials to solve simple subtraction problems (take 1, 2 or 3) or use materials to solve missing addend (5 and something makes 8) problems using ‘make-all/count-all’ strategy

• ### Where to next?

Solves and poses ‘difference’ problems (1-10) using counting back (1, 2 or 3) from known or part-part-whole knowledge
ie. Solve missing addend problems (numbers to 10) mentally

• ### Purpose

Addition and subtraction are an important part of the skill set of a numerate person and are foundational skills for the other operations (multiplication and division) as well as for the larger body of mathematics.

• ### Building Addition and Subtraction skills:

#### Resources

Many of these activities are the same as those in the Part-Part-Whole section as the core concepts are identical. There is an added emphasis her on connecting these ideas to the language of addition and subtraction however.

### Activities and Assessments

Focus: Quickly finding the total of two numerals, where one is in the range to 3 – memorising addition facts.

Blank Beehives to 20 – Concealed Subtraction

Adapted from ‘Beehive’, Developing Efficient Numeracy Strategies Stage 1 page 34. NSW Department of Education and Training, Professional Support and Curriculum Directorate 2003

Focus: Subtracting a small number from a hidden collection. Learning to mentally subtract with less access to visual cues.

How: See Beehive Activity 4b

Beehives boards

Bees template

Part-part whole board : Difference

Focus: Solving “difference” or “missing addend” problems for totals to 10 without the use of counters or visual cues.

Part-part-whole board

Bees template