# Column subtraction 4: Lesson 3: walruses

## The Maths Bit!

In this exciting lesson, you will need to solve a range of subtraction word problems that feature walruses. Try using **PAWS** to arrive at the right answer!

**P ** = Picture the problem in your mind.

**A **= Annotate the word problem by highlighting the important information.

**W** = Write down the number sentence that needs to be solved.

**S** = Solve the number sentence using an efficient strategy.

**Prior learning: **Subtract a 3-digit number from a 4-digit number with one or more exchanges, including an exchange across more than one place value.

## Use PAWS, counters and column subtraction to solve the following word problem.

In a single week, a large male Pacific walrus managed to remove the flesh from 6,457 clam shells. This particular walrus had a weight of 1,453 kilograms. His mating partner was 729 kilograms lighter.

**What was the weight of the male walrus’ mating partner?**

**Did you know?**

A walrus is a heavy creature because it has lots of blubber beneath its skin. This blubber (fat) keeps it warm and provides it with energy. However, a male walrus is much heavier than a female walrus.