Year 2 have been learning about addition and subtraction strategies with 2 digit numbers these past couple of weeks. The children will continue practicing these strategies in this weeks homework. I have created examples of each strategy to help you understand these strategies as well. The three strategies we have learnt are the split, jump and inverse strategies. I hope this helps!
Split Strategy
This strategy involves breaking up numbers according to their place value. If I had the problem 26+ 32 I would first add the tens and then the ones of each number before combining to obtain the final answer.
This is how it would look:
26 + 32 =
20 + 30 = 50
6 + 2= 8
50 + 8 = 58
Inverse Strategy
This is a subtraction strategy, where you add on from the smallest number to reach the largest number.
Inverse strategy method:
eg 65 – 37
start at 37
add 3 to make 40
then add 20 to make 60
then add 5 to make 65
and so the answer is 3 + 20 + 5 = 28
The Jump Strategy
This is an addition and subtraction strategy in which the student places the first number on an empty number line and then counts forward or backwards, first by tens and then by ones, to perform a calculation.
Example:
46 + 31 =
79 – 33 =
Split Strategy
This strategy involves breaking up numbers according to their place value. If I had the problem 26+ 32 I would first add the tens and then the ones of each number before combining to obtain the final answer.
This is how it would look:
26 + 32 =
20 + 30 = 50
6 + 2= 8
50 + 8 = 58
Inverse Strategy
This is a subtraction strategy, where you add on from the smallest number to reach the largest number.
Inverse strategy method:
eg 65 – 37
start at 37
add 3 to make 40
then add 20 to make 60
then add 5 to make 65
and so the answer is 3 + 20 + 5 = 28
The Jump Strategy
This is an addition and subtraction strategy in which the student places the first number on an empty number line and then counts forward or backwards, first by tens and then by ones, to perform a calculation.
Example:
46 + 31 =
79 – 33 =