Theme 10.  Subtraction with regrouping within 20

In the theme you learn:
• You will improve your skills in calculating expressions with one and two operations within 20;
• You will learn how to do subtraction within 20 with regrouping;
• You will learn to subtract one-digit numbers with regrouping by breaking numbers into easy parts;
• You will practice changing named numbers written in decimeters and centimeters;
• You will write a short note and solve problems.