Shapes: Area of Triangles and Parallelograms

Today we're tackling area of triangles and parallelograms. Ask your child to explain the first step out loud before writing. Slow thinking now means fewer mistakes later. Encourage neat, line-by-line work. If they get stuck, ask, 'What operation is happening to the variable?' and let them lead.

• pencil
• paper
• scratch paper

Solve: 12 × 11. Then check by adding (12 × 10) + 12. Same answer? Good — you used a strategy.

1. 1

   Area of a rectangle with length 14 and width 12.

   Parent tip: Walk through this step-by-step with your child. Say each step out loud.
2. 2

   Perimeter of a rectangle with length 7 and width 13.

   Parent tip: Walk through this step-by-step with your child. Say each step out loud.

1. 1

   Area of a rectangle with length 14 and width 6.
2. 2

   Perimeter of a rectangle with length 13 and width 4.
3. 3

   Perimeter of a rectangle with length 7 and width 5.
4. 4

   Perimeter of a rectangle with length 13 and width 11.
5. 5

   Perimeter of a rectangle with length 14 and width 4.
6. 6

   Area of a rectangle with length 8 and width 12.
7. 7

   Perimeter of a rectangle with length 6 and width 5.
8. 8

   Perimeter of a rectangle with length 5 and width 10.
9. 9

   Perimeter of a rectangle with length 9 and width 14.
10. 10

    Area of a rectangle with length 11 and width 13.

Which problem made you think the hardest today? Why?