Here are some Math resources for the primary age students. Allow students to use manipulatives to gain understanding of the concepts you are teaching. Great tools are unifix cubes, pattern blocks, hundreds-tens-ones blocks, dominoes, cuisenaire rods, buttons, lids, and various items to count. Remember their age and development stage; reread Piaget and the greats to confirm your choice of allowing children to use manipulatives to understand counting, place value, addition, subtraction, multiplication and division.
There are many simple things you can do to help your students understand a concept... for example, use masking tape to divide their desk in half, right down the middle, left side is their 'holding space', right side is their 'working space'. Give each student one hundred unifix cubes assembled into ten long. Now give them directions to manipulate the cubes i.e. 'show me 30' - students place 3 tens on their working space, divide 30 into 6 equal groups, thus they see 30 divided by 6 = 5. The possibilities are endless. Use recording sheets to show work. You could keep them busy all year with unifix cubes.