Counting Gloves: A Grade 3 Math Challenge

In this virtual math lesson, the teacher and Otto explore the concept of counting and multiplication through a practical problem of knitting gloves for friends. Initially, they plan to make six gloves for six friends but realize each friend has two hands, requiring more gloves. The lesson covers skip counting by twos to find the total number of gloves needed, forming equal groups, and writing number sentences. It introduces multiplication and unit form to simplify calculations and highlights the importance of equal groups for multiplication. The lesson concludes with a recap of key learnings.

Why did Otto think that six gloves would not be enough for six friends?

• Each friend has three hands.

• Each friend has one hand.

• Each friend has two hands.

• Each friend has four hands.

Tags

CCSS.3.OA.A.3

How many gloves are needed for six friends if each friend has two hands?

• 6

• 8

• 10

• 12

Tags

CCSS.3.OA.A.3

What counting strategy was used to determine the total number of gloves needed?

• Counting by ones

• Skip counting by twos

• Counting by threes

• Skip counting by fives

How many pairs of gloves are there in a pile of 12 gloves?

• 6 pairs

• 3 pairs

• 4 pairs

• 5 pairs

Tags

CCSS.5.OA.B.3

Which number sentence represents six groups of two gloves?

• 5 + 5 + 2

• 2 + 2 + 2 + 2 + 2 + 2

• 4 + 4 + 4

• 3 + 3 + 3 + 3

Tags

CCSS.2.OA.C.3

How can six groups of two be represented in unit form?

• 6 / 2

• 6 * 2

• 2 * 6

• 6 + 2

Tags

CCSS.2.OA.C.3

Which multiplication sentence represents two groups of four?

• 4 * 2

• 4 + 4

• 2 * 4

• 2 + 4

Tags

CCSS.3.OA.A.1

What is the correct number sentence for counting gloves when groups are not equal?

• 2 + 2 + 8 = 12

• 2 * 3 = 6

• 3 * 2 = 6

• 8 + 2 + 2 = 10

Tags

CCSS.2.OA.C.3

What did we learn about skip counting?

• It helps find the total number of objects in a set.

• It is used to divide objects.

• It is used to subtract objects.

• It is used to multiply objects.

Tags

CCSS.1.NBT.A.1

Why do we need groups of equal size to multiply?

• To make counting easier.

• To ensure accurate multiplication.

• To avoid addition.

• To simplify division.

Tags

CCSS.3.OA.A.1