https://apps.mathlearningcenter.org/number-pieces/
Using hundreds tens and units to demonstrate numbers
https://apps.mathlearningcenter.org/number-frames/
Number frames - also includes hundreds frame
Place value charts to THHTU https://www.topmarks.co.uk/place-value/place-value-charts
Counting or moving blocks to make numbers http://www.roomrecess.com/pages/BaseTenBlocks.html
Demonstrate making numbers http://www.abcya.com/base_ten_fun.htm
Write the number - up to hundred using whiteboards
Using blocks - write and show - how many tens in - up to hundreds
Digital Learning tool http://www2.nzmaths.co.nz/LearningObjects/numbers/numbersEN123.html
Number of the Day https://mathsstarters.net/numoftheday
Number of the day junior https://mathsstarters.net/numoftheday/junior
https://mathsstarters.net/
https://www.mathantics.com/