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Mental computation

MC_A_AP_AP2_fig1

Mental strategy observation checklist.

MC_B1_I1_E1_fig1

Use of an empty number line.

MC_B1_I1_E1_fig1

MC_BI_I1_E3_fig1

Hundred board showing counting on.

MC_BI_I1_E3_fig12

MC_BI_I1_E4_fig1

MC_BI_I1_E4_fig2

MC_BI_I2_E1_fig1

Array models illustrating commutative processes for multiplication.

MC_BI_I2_E2_fig1

MC_GT_T1_E2_A1_fig1

Screen grab from L91 The part-adder: make your own easy sums.
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