Maths Knowledge/Strategy Reflection - E-portfolio Sample
Patiki/Whetu
Goals:
- Know how many tens in a number, e.g. 43 tens in 435.
- Use place value partitioning to subtract 135-75= 135-70= 65-5=60
- Use reversibility to change a problem around, e.g. 403 - ? = 97, 97 + ? = 403
Answer the following questions, SHOW YOUR WORKING!
1. How many groups of 10 are in 175? There are 17 tens in 175. I counted in tens to
175 and this is what I got: 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 and then
counted each and got 17 with 5 left over.
2. How many groups of 100 are there in 1245? 12 hundreds are in 1245 because I learned in the
group that we take of the 5 and thats the answer.
group that we take of the 5 and thats the answer.
4. 
160- 30=130. 130+5=135. 135-7=128.
600-293=307. 307+15=322.

