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

Use a number line or one hundred square to help you find the missing number.

Which number would complete the part-part-whole model correctly?

Use the part-part-whole model to help you complete the equation. 43 - {{ }} = 42

Complete the stem sentence. {{ }} is one more than 76

Tick the equations that would represent, '25 is one less than 26'

Fill in the missing number. ___ is one more than 8

Alex is thinking of two numbers which have a difference of 1     One of the numbers is 15     What could the other number be? 

Starter Quiz