The Problem Slips: Subtraction Working Charts is a Mathematics Montessori material designed for children aged 3-6, crafted by Nienhuis Montessori to AMI standards.
These Problem Slips for Subtraction Working Charts provide systematic practice for young mathematicians mastering subtraction facts. Housed in two clear acrylic storage boxes, the cards feature green line indicators that guide children through progressive subtraction exercises, supporting the transition from concrete manipulatives to abstract mathematical thinking.
“Children display a universal love of mathematics, which is par excellence the science of precision, order, and intelligence.”— Maria MontessoriThe Discovery of the Child
“The greatest sign of success for a teacher is to be able to say, 'The children are now working as if I did not exist.'”
— Maria Montessori, The Absorbent Mind
The Problem Slips for Subtraction Working Charts serve as a bridge between concrete mathematical manipulation and abstract numerical thinking in the Montessori mathematics curriculum. These cards, stored in clear acrylic boxes for easy visibility and access, present subtraction problems in a systematic sequence that respects the child's mathematical development. The green line indicators on each slip provide visual guidance without overwhelming the learner, allowing children to work through subtraction facts at their own pace. Unlike traditional worksheets, these problem slips isolate individual equations, enabling focused concentration on one mathematical relationship at a time. The cards complement the Subtraction Working Charts by providing structured practice opportunities that reinforce pattern recognition in subtraction facts. Through repeated work with these problem slips, children internalize the relationships between numbers, building the foundation for mental calculation. The clear acrylic storage boxes ensure the materials remain organized and accessible, inviting independent mathematical exploration.
Each order includes everything needed for proper presentation and long-term use.
Follow the Montessori method of presentation for optimal child development.
Select the first problem slip from the box, noting the green line indicator
Read the subtraction problem aloud, then solve using the working chart if needed
Record or place the answer using tiles or writing materials
Check the answer using the control chart before moving to the next slip
Continue through the sequence, placing completed slips in the designated container
Every material is carefully selected for durability, safety, and authentic Montessori experience.
Sourced from sustainably managed European forests. Beechwood is chosen for its exceptional durability, smooth grain, and natural warmth that invites touch.
Natural, unbleached cotton in child-friendly colors. The fabric provides the right amount of friction for developing fingers while being gentle on sensitive skin.
Water-based, child-safe finish that meets the strictest European safety standards. Designed to withstand years of daily use without chipping or peeling.
Each material supports multiple areas of child development simultaneously.
Systematic practice helps children internalize subtraction facts through repetition and self-correction.
Transitions children from concrete materials to abstract number relationships and mental calculation.
Clear organization allows children to select, work through, and return materials autonomously.
Green indicators guide progression through increasingly complex subtraction combinations.
Designed for child-sized hands
Professional tips from AMI-trained guides to maximize the educational value of this material.
“Introduce problem slips only after the child has worked extensively with the Subtraction Strip Board and memorized some facts”
Observe which facts challenge each child and provide targeted practice with those specific slips
Create a recording system where children can track their progress through the complete set
Use the green line indicators to help children organize their work systematically on the table
Everything you need to know about this material.
The green line indicators are visual guides that help children understand where to place their fingers or markers when working through subtraction problems on the working charts. They provide a systematic approach to solving equations and help children develop proper mathematical habits.
These problem slips work in conjunction with Montessori Subtraction Working Charts (sold separately). Children select a slip, find the corresponding equation on their working chart, and use the chart to discover the answer, creating a hands-on, self-correcting learning experience.
The slips are organized systematically, starting with simple subtraction facts (like 9-1) and progressing to more complex equations. This gradual progression allows children to build confidence while mastering all subtraction combinations from 18-1 through 18-9.
The two clear acrylic boxes keep the problem slips organized and visible, allowing children to independently select and return materials. This promotes order, responsibility, and helps children see their progress as they work through different sets of equations.
Children typically begin using these problem slips after they have worked extensively with concrete subtraction materials like the subtraction strip board and have been introduced to the subtraction working charts. This usually occurs around ages 4.5-6, though readiness varies by child.
Can't find what you're looking for?
Contact Our Experts
Share your experience with this material and help other educators and parents.
