The focus of the Adding Up to Four Two-Digit Numbers intervention is adding two-digit numbers with base ten blocks.There are four phases to this intervention. Phases 1 to 3 focus on adding 2 two-digit numbers and progress from no regrouping to regrouping in both the ones and tens. Phase 4 focuses on adding 3 or 4 two-digit numbers.

The focus of the Building and Writing Three-Digit Numbers intervention is the number of hundreds, tens, and ones that make a three-digit number. It has three phases. Phase 1 is an introduction to the use of place value charts, base ten blocks, and number cards. Phases 2 and 3 move from three-digit numbers that have zero tens and zero ones to all kinds of three-digit numbers.

The focus of the Finding Ten More or Ten Less intervention is to mentally the number that is ten more or ten less. This intervention has two phases that begin with using base ten blocks, moves to drawings and the hundred chart, and then moves onto mental math. Phase 1: Find the number which is ten more. Phase 2: Find the number which is ten less.

This lesson plan is designed to provide a resourch for teachers who have students needing extra support with subtraction and regrouping through the place value chart up to 1,000. It primarily targets using base ten blocks to help students visualize and manipulate regrouping. 

The focus of Three-Digit Number Recognition intervention is naming three-digit numbers that are modeled with base ten blocks. It also includes naming three-digit numbers from base ten blocks which are presented in random order. For example: 5 tens, 2 ones, and 4 hundreds.

The focus of the Two-Digit Number Recognition intervention is to build and identify two-digit numbers. It has two phases. Phase 1: Use base ten blocks and a place value chart to identify two-digit numbers up to 99. Phase 2: Find two-digit numbers in a hundreds chart.