Children use 'Earth&' times as a base.\n\nThey must add or subtract set amount of time (e.g. 1hr 30mins) to each of the earth activity times.\n\nGood exercise for adding and subtracting time ...
Adding and subtracting time is often a complicated task. Addition isn’t impossible, because the minutes and seconds can be added in their places, and then the seconds that exceed 59 can be reduced and ...
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