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Mental computation

MC_A_AP_AP2_fig1

Sample of checklist showing four strategies (place value with tens first, place value with ones first, friendly numbers, inverse). Responses for four students with teacher notes and comments.

Mental strategy observation checklist.

MC_B1_I1_E1_fig1

Problem of 28 + 36 shown as start at 0, jump 20 to 20, then jump 30 to 50, then jump 8 to 58 then jump 6 to 64.

Use of an empty number line.

MC_B1_I1_E1_fig1

MC_B1_I1_E1_fig1

MC_BI_I1_E3_fig1

Hundred board starting at 26 and counting on to 32.

Hundred board showing counting on.

MC_BI_I1_E3_fig12

MC_BI_I1_E3_fig12

MC_BI_I1_E4_fig1

MC_BI_I1_E4_fig1

MC_BI_I1_E4_fig2

MC_BI_I1_E4_fig2

MC_BI_I2_E1_fig1

MC_BI_I2_E1_fig1

Array models illustrating commutative processes for multiplication.

MC_BI_I2_E2_fig1

MC_BI_I2_E2_fig1

MC_GT_T1_E2_A1_fig1

Problem is 28 plus 7, broken into 28 plus 2 plus 5 to equal 35.

Screen grab from L91 The part-adder: make your own easy sums.
Source: © Education Services Australia, 2011.

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