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Block 2 - Addition and Subtraction
Key Concept 1: I can add two 2-digit numbers.
Watch this video clip to help with this concept. There is an activity towards the end of the clip.
Adding 2 Digit Numbers -1.m4v
Key Concept 2: I can subtract two 2-digit numbers.
Watch this video clip to help with this concept. There is an activity towards the end of the clip.
Subtract Two 2-Digit Numbers-1.m4v
Key Concept 3: I can add / subtract two 2-digit numbers that cross the tens boundary.
This is perhaps the most challenging part of addition and subtraction for Year 2 children. Any practise of this skill at home as shown in the videos below will be beneficial.
Adding 2 Digit Numbers that cross the 10s boundary_Trim.mp4
In this clip we look at 38+25 =
We know that this will cross the tens boundary because when the ones are added together they are larger than ten. 8 + 5 will be larger than ten so this calculation will cross the boundary and we need to calculate the answer as shown in the clip.
We know that this will cross the tens boundary because when the ones are added together they are larger than ten. 8 + 5 will be larger than ten so this calculation will cross the boundary and we need to calculate the answer as shown in the clip.
SMART Notebook subtract- Slides _ - SMART Notebook (1)_Trim.mp4
In this video clip we look at 53 - 26 =
We know that this calculation will cross the tens boundary because 3 ones subtract 6 ones would be less than 0.
We looked at this in class by recognising that 3 ones is not enough to subtract 6 ones in one jump on the number line so we have to partition it as shown in the video clip.
We know that this calculation will cross the tens boundary because 3 ones subtract 6 ones would be less than 0.
We looked at this in class by recognising that 3 ones is not enough to subtract 6 ones in one jump on the number line so we have to partition it as shown in the video clip.