Not wasting time or effort. An efficient strategy is one we can carry out easily.

Solve problems involving the addition of two-digit numbers

Maths

Use efficient addition strategies to calculate

Combine tens and ones within equations

Add two-digit numbers without crossing the tens boundary

Find the missing addend when adding two-digit numbers

Add 2-digit numbers when crossing the tens boundary

Explain different strategies used to subtract

Solve equations involving the subtraction of two-digit numbers

Solve problems involving subtraction of two-digit numbers

Subtract two-digit numbers crossing the tens boundary

Find the missing part when subtracting two-digit numbers

Solve problems involving subtraction when bridging 10

Use efficient methods to solve subtraction equations

Solve problems involving addition and subtraction

Create addition and subtraction problems

In this unit pupils apply their knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers both within and across the tens boundary. In the future unit pupils will add 3 addends, understanding they can be added in any order, bridging through 10.

In the prior unit pupils added and subtracted 1s and 10s from 2 digit numbers. They used number facts to add/subtract a single-digit number to/from a 2-digit number and used a part-part-whole model to represent addition and subtraction. In this unit pupils apply knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers within and across the tens boundary.

In this unit pupils apply their knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers both within and across the tens boundary.

Addition and subtraction of two 2-digit numbers

Solve the addition problem. Izzy has 34 beads on her bracelet and she adds 42 more. Use the strategy you find most efficient to solve the problem. {{ }}

Which strategy is the most efficient when solving this problem? There are 38 cows in the field and 57 in the barn. How many cows are there altogether?

Which of the following is the most efficient way to solve this problem? There were 68 children in the hall, then 23 more children went in. How many children are in the hall now?

Izzy sees 42 birds and Andeep sees 76 birds. How many more birds does Andeep see?
How many tens will be in the missing addend when the equation is written for this problem?

Izzy had 46 seeds in her packet and Andeep had 72 seeds in his packet. How many more seeds did Andeep have than Izzy?

Andeep counts 59 minibeasts and Izzy counts 83 minibeasts. How many more minibeasts does Andeep count?

Solve the equation in the most efficient way. 48 + 34 = {{ }}

Find the missing whole in the bar model. The missing whole is {{ }}

Which equation is represented by this number line?

Which of the following is the missing addend? {{   }} + 36 = 51

Find the missing addend. 47+ {{   }} = 73

Solve problems involving the addition of two-digit numbers

Lesson outcome