We have been working very hard on partitioning shapes into equal parts as well as practicing several mental math strategies for +/- numbers 0-20.
Partitioning means to divide shapes into EQUAL parts.
Halves (half, 1/2)- a shape divided into 2 EQUAL parts. A half is 1 of the 2 equal parts.
Thirds (1/3)- a shape divided into 3 equal parts. A third is 1 of 3 equal parts.
Fourths (1/4) – a shape divided into 4 EQUAL parts. A fourth is 1 of the 4 equal parts.
Students need to be able to partition rectangles and circles into halves, thirds, and fourths SEVERAL different ways.
Mental Math Strategies to know:
- Make a 10
- Doubles, Doubles +/-1
- Near 10
- Fact Families
- Decomposing
Here is a copy of the 2nd+Grade+Pre-Test+Unit+8