Atlas of Difficulties

The child can't see a quantity without counting (impaired subitizing)

The child always counts from one and can't “count on”

The child skips numbers when counting or says them out of order

The child confuses 14 and 40, 15 and 50 — numbers that sound alike

The child thinks the quantity changes when objects are rearranged

The child writes digits mirrored: 6 instead of 9, 12 instead of 21

The child doesn't know number bonds: doesn't see that 7 is 3 + 4

The child doesn't understand place value: can't see the tens in a two-digit number

The child loses the intermediate result while calculating

The child can't memorize the multiplication table

The child knows the multiplication table in order, but not out of order

The child doesn't understand a word problem: can't see where the question is

The child doesn't know which operation to choose in a problem (+, −, ×, ÷)

The child can't solve a two-step problem

The child confuses left and right — and it gets in the way of math

The child can't find their way around a sheet of paper: mixes up rows and place values

The child doesn't understand time: mixes up the days of the week, can't read a clock

The child confuses similar digits when writing: 6 and 9, 3 and 8

The child doesn't understand comparison signs: confuses < and >

The child can't find the odd one out or group objects together

The child doesn't see patterns and can't solve by analogy

The child doesn't understand math words: add, subtract, between

The child can't solve a word problem: loses the data and mixes up the operations

The child counts one by one: gets stuck counting on fingers