Begin teaching NUMBER BONDS by using Use paper chains in different colours ti demonstrate. To the tune of Row Row Row your boat 9 and 1 are number bonds 8 and 2 are friends 7 and 3 6 and 4 5 and 5 are twins. Later, have them show it different ways.
Laminate a number ladder, cut small slits in top & bottom & add a pipe-cleaner with a small bead. Use the bead to slide up & down as you complete addition & subtraction problems (",). could do the same thing with a horizontal number line.
Unifix cubes are a concrete representation of addition/number bonds. Building the bond with the Unifix cubes is what develops number sense. Great use for flash cards instead of looking for just memorization
Include a large multiplication array chart in the classroom to allow for an interactive math experience for the students. Students can analyze the change in various contexts and describe qualitative change with the different arrays.
Addition and subtraction anchor charts to help the kids remember which way to go on the number line. For even more visual support, place arrows above or below a number line in the direction of subtraction or addition.