Grade 2 | MATHEMATICS
WEEK 14 • STUDENT TEXTBOOK • DAYS 66–70
Read each lesson with a parent or teacher and study the worked example. Then answer the questions for that day in the Week 14 Practice Workbook.
Week 14 Student Textbook | Week 14 Practice Workbook | Week 14 Teacher Guide | Week 13 Student Textbook | Grade 2 index
Day 66: Rows and Columns of Squares
A rectangle can be split into squares that are all the same size. The squares make rows that go across and columns that go up and down.
To split a rectangle, draw straight lines across for the rows and straight lines up and down for the columns. Then count the squares. Every square must be the same size.
Worked example: A rectangle has 2 rows with 3 squares in each row. How many squares are there?
- Count the first row: 3.
- Count on the second row: 4, 5, 6.
Worked answer: 6 squares.
Day 67: Count Squares with Repeated Addition
Instead of counting squares one at a time, add the rows. If each row has the same number of squares, you add the same number again and again. This is repeated addition.
You can also add the columns. A rectangle with 2 rows of 5 squares has 5 + 5 = 10 squares. Its 5 columns of 2 squares give 2 + 2 + 2 + 2 + 2 = 10. Both ways give the same total.
Worked example: A rectangle has 3 rows with 2 squares in each row. Write an addition equation for the total.
- Each row has 2 squares.
- There are 3 rows, so add 2 three times.
Worked answer: 2 + 2 + 2 = 6.
Day 68: Arrays and Equal Addends
An array is a group of objects arranged in equal rows and columns, like eggs in a carton or chairs set out for a meeting.
To find how many objects are in an array, write an equation with equal addends: add the same number once for each row. An array can have up to 5 rows and 5 columns in these lessons.
Worked example: An array has 2 rows with 3 dots in each row. Write an equation for the total.
- Each row has 3 dots.
- There are 2 rows, so add 3 two times.
Worked answer: 3 + 3 = 6.
Day 69: Cover a Rectangle with Squares
Covering a flat surface with equal squares, with no gaps and no overlaps, shows how many squares it takes to fill the space.
The squares line up in rows and columns. Count the rows, count the squares in one row, then add equal addends to find the total.
Worked example: A tray is covered with 2 rows of 4 sticky notes. How many sticky notes are there?
- Each row has 4 notes.
- 4 + 4 = 8.
Worked answer: 8 sticky notes.
Day 70: Independent Check: Rows, Columns and Arrays
Today you will answer on your own.
Use what you learned this week: rows and columns of equal squares, repeated addition, and arrays with equal addends.
Worked example: A rectangle has 3 rows with 3 squares in each row. How many squares are there?
- Each row has 3.
- 3 + 3 + 3 = 9.
Worked answer: 9 squares.
Week 14 Student Textbook | Week 14 Practice Workbook | Week 14 Teacher Guide | Week 13 Student Textbook | Grade 2 index
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