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## Item description

10 dynamic addition problems with the control of error (sum/answer) included on the back of the addition problem so children really can work and check their work independently.

This material is suitable for any classroom, homeschool, or educational environment – you do not have to be a Montessori teacher. Save yourself HOURS of work!

These Montessori addition questions are for practicing independent work in math. They can be used with any number of materials or for mental math.

Many other command card sets do not include the answer on the back, which makes the child reliant on the teacher for the control of error.

The numerals are coloured according to the Montessori math hierarchical colors. The cards are numbered ‘D1’ (Dynamic 1) through ‘D10’.

Children can use these cards with Montessori materials if they wish. Suggested materials include stamp game, small bead frame, or golden bead material.

### Standards

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

Add up to four two-digit numbers using strategies based on place value and properties of operations.

Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases: