An addition or subtraction strategy where numbers are partitioned to reach the previous or next multiple of 10, so bonds to 10 can be used to calculate more efficiently.

Solve problems involving subtraction when bridging 10 

Maths

In this 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 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 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.

Addition and subtraction of two 2-digit numbers

In which of the following equations will you have to bridge 10?

Which of the following equations is correct?

Solve the following equation. 75 − 47 = {{ }}

64 tickets are needed to buy a cap and the unicorn. If the unicorn costs 36 tickets, how much does the cap cost? {{ }} tickets.

Izzy had 85 tickets and she bought a pair of sunglasses at the ticket shop. Now, she has 38 tickets left. How much did the sunglasses cost? {{ }} tickets.

Match each equation to the correct answer.

Which equation has a whole that is a multiple of 10?

Which bar model represents the equation shown? 61 = 93 − ?

Write the addition equation you would use to check this subtraction. 84 − 37 = 47

Which number would solve the equation. 54 − {{   }} = 31

Which bar model would represent the equation shown? {{   }} − 14 = 46

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