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Using the any–order property

Question 1

Carry out these additions mentally.

a check answer for question 1a_tab1.
b check answer for question 1b_tab1.
c check answer for question 1c_tab1.
d check answer for question 1d_tab1.
e check answer for question 1e_tab1.

Question 2

Carry out the following additions mentally.

a check answer for question 2a_tab1.
b check answer for question 2b_tab1.
c check answer for question 2c_tab1.
d check answer for question 2d_tab1.