Subtract a pair of 2-digit numbers by finding the difference

Maths

Add two 3-digit numbers using partitioning

Add two 3-digit numbers using adjusting strategies

Add 2 and 3-digit numbers by redistributing

Choose the most efficient strategy to add two 3-digit numbers

Subtract 2 or 3-digit numbers using partitioning and bridging a multiple of 10

Subtract 3-digit multiples of 10 by finding the difference between them

Choose the most efficient strategy to subtract from a 3-digit number

Use addition and subtraction to solve problems involving bar charts, pictograms and tables

Use addition and subtraction to solve problems in different contexts

In this unit pupils will add and subtract two 3-digit numbers using partitioning, adjusting, redistribution and bridging. In the future unit pupils will accurately and efficiently solve multi-step addition and subtraction problems. They will understand and explain how both addition and subtraction equations can be used to describe the same additive relationship.

In the prior unit pupils found pairs of number that composed 100 and positioned 3-digit numbers on a number line and estimated their position on unmarked number lines. They compared and ordered 3 digit numbers. In this unit pupils will add and subtract two 3-digit numbers using partitioning, adjusting, redistribution and bridging

In this unit pupils will add and subtract two 3-digit numbers using partitioning, adjusting, redistribution and bridging.

Informal and mental strategies for adding and subtracting two 3-digit numbers

Match the numbers with words for the equation 8 − 6 = 2

Which of these bar models represents finding the difference?

How many more sweets do I have compared to you?

Which of these contexts does not involve finding the difference?

Which of these subtraction expressions can be more efficiently solved by finding the difference?

What number is represented by these place value counters?

What number is represented by the base ten blocks?

Choose the correct symbol to go between the expressions.  7 + 5 ___ 3 + 4

Choose the correct symbol to go between the expressions. 20 − 3 ___ 12 + 10

Choose the correct symbol to go between these expressions. 34 − 10 ___ 14 + 10

Using your understanding of place value, order these numbers from smallest to greatest.

Subtract a pair of 2-digit numbers by finding the difference

Lesson outcome