I can solve any 2d tens number to another one.

Step 1:

a) Use knowledge of 1d + 1d to find out how many ten there are.

b) Put the zero on to make it a total of tens

Step 2:

Carry it out mentally, writing only the answer

I can add a 2d tens number to a 2d number without crossing the 10.

Step 1:

a) Partition the 2d number and add the tens together.

b)Add the tens total to the units.

Step 2:

Repeat the process but add the tens together mentally.

Step 3:

Finally, record only the final answer.

I can add a 2d number to a 2d number without crossing 10s/100s.

Step 1:

a) Partition both numbers and add the tens together and the units together.

b)Add the total of tens and units together.

Step 2:

Repeat the process but combine the tens and units mentally.

Step 3:

Repeat the process but record only the final answer.

I can solve any 2d + 2d

Step 1:

a) Begin in the same way as the previous method.

b)Partition the units total and add the 10 to the tens total.

c) Add the remaining units to the tens total.

Step 2:

Repeat the process but combine the tens total and the units total mentally.

Step 3:

Repeat the process but combine the original tens and units mentally.

Step 4:

Repeat the process but record only the final answer.

I can solve 3d + 3d

Step 1:

a) Add the hundreds.

b

b)Add the tens.

c) Add the units.

d) Add the totals

Step 2:

Repeat the process but write only the totals.

Step 3:

Repeat the process but write only the answer.

I can solve any 3d + 3d

Same process but requires bridging 10s/100s/1000s.

I can solve 3d + 3d – Alternative

Step 1:

a) Construct a number line with larger number on left hand side.

b) Add the hundreds of the other number.

c) Add the tens.

d) Add the units.

Step 2:

Repeat the process but don’t write the final subtotal. Hold that in your head.

Step 3:

Repeat the process but don’t write either subtotal. Hold them in your head.

Step 4:

Repeat the process but write only the answer. (If required, use more steps using the number line but gradually removing the written units-tens-hundreds)