Theme 2.  Adding and subtracting 7. Comparing values of number expressions

In the theme you learn:
• You will learn how to add and subtract 7 using a number line;
• You will learn to calculate expressions with adding and subtracting 7;
• You will solve problems to find the sum, the difference, to increase a number by a few units, and to compare numbers by difference;
• You will practice finding the sum of three addends and the difference with two subtrahends;
• You will learn to compare the values of number expressions.