P_CM_M4_fig1

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Five triangular arrays, with the number of dots on each side varying from one to five. The number of dots in each array is also given: 1, 3, 6, 10 and 15.

Triangular numbers.

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A hollow square, with each side consisting of a line of green-yellow-green-yellow cubes.

P_CM_M1_A1_...

A number line from zero to twenty, with multiples of two labelled and with a dot on the mark for zero and then every third mark.

P_CM_M3_TA1...

A number line from zero to twenty, with every number labelled and with a dot on the mark for zero and then every third mark.

P_CM_M3_TA1...

A line of twenty squares filled with the numbers one to twenty. Every third square is coloured green.

P_CM_M3_TA1...

Three groups of squares: a single square, two adjacent squares and a row of three adjacent squares. One circle is placed next to each exterior side of each square.

P_CM_M4_A1_...

A number line from zero to twelve, with every number marked and labelled and an arrow pointing past twelve.

P_CM_M3_fig3

Six dots arranged in a triangular pattern with three dots on each side.

P_CM_M2_A1_...