The number that is one more than another is the result of adding 1 to that number

The number that is one less than another is the result of subtracting 1 from that number

The result of subtracting one number from another. How much one number differs from another.

Add and subtract one to or from a two-digit number within a decade

Maths

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction. In the future unit pupils will learn to find 10 more or less than a 2-digit number They will  add and subtract 10 to/from a 2-digit number using number facts

In the prior unit pupils added 3 addends. They used strategies such as finding 2 addends to total 10 or 2 numbers to bridge though 10. In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

Adding and subtracting ones and tens to and from 2-digit numbers

One more is when there is a greater amount by one or another item in the set.

One less is when there is a smaller value by one.

The result of subtracting one number from another, How much one number differs from another.

A group of ten numbers below one hundred, each with the same tens digit.

To exchange ten ones for one ten or one ten for ten ones in order to calculate more easily.

Add and subtract 1 to and from a 2-digit number crossing the tens boundary

An equation has an equal sign. It shows that what is on the left of the equation is equal to what is on the right.

Use number facts to add or subtract a one-digit number and a two-digit number.

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

Use number facts to solve addition and subtraction problems.

Use number facts to solve problems in measures and data contexts

Use number bonds to 10 to add/subtract one-digit and two-digit numbers

A mental strategy which uses addition or subtraction to cross a number boundary.

The act of splitting an object or value down into smaller parts.

Add by bridging a multiple of ten 

A strategy that involves using a multiple of ten as a 'bridge' so numbers can be partitioned to make use of bonds to ten and calculate efficiently.

Subtract by bridging a multiple of ten

A strategy that involves using a  multiple of ten as a 'bridge', so numbers can be partitioned to make use of bonds to ten.

Use bridging to solve addition and subtraction problems

10 more than is when there is a greater amount by 10 than another item in the set.

10 less than is when there is a smaller value by 10

Make something bigger (in size or quantity).

Make something smaller (in size or quantity).

Find 10 more or less than a 2-digit number. 

Add and subtract 10 to and from a 2-digit number.

The numbers that are said when we count on in tens from zero. Multiples of ten always have a ones digit of zero.

To add the parts of a number gained through partitioning the whole to reach the whole amount again.

Add multiples of 10 to 2-digit numbers.

To add the parts of a number gained through partitioning the whole to reach the whole again.

Subtract multiples of ten from 2-digit numbers

Partition 2-digit numbers in different ways

A method used to solve a problem or equation.

A graphical display of data using bars of different heights; another name for a bar graphs.

Adding and subtracting ones and tens to and from 2-digit numbers

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These lessons will be removed by end of Summer Term 2025.