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Media > TDT > Mental computation > MC_GT_T1_E3_A4_fig1

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MC_GT_T1_E3_A4_fig1

MC_GT_T1_E3_A4_fig1

Adding with a bead string (solution 1).

A string of beads, alternating every ten beads from green to pink. The problem is to add 27 to 58. First peg is at 58 with a jump of 20 to reach 78, then a jump of 2 to reach 80 then a jump of 5 to reach the answer of 85.