So start by crossing off any number that is excluded. Keep moving through the cards until there is just one number left. That is the mystery number! My kids enjoyed acting like detectives while doing their math
Try this worksheet to complete the above exercise, marking the numbers that are Right Next To Each Other and crossing out the ones that are not. After finishing the above exercise, try the Right Next To Each Other worksheet that also includes some review of the Backwards 1 and Number +1 ...
Once, you break your ten into ones then instead of drawing the lines and crossing them you can use your fingers. Example If we have to subtract 18 cars from 20 cars. Then in one’s column, 0 – 8 does not make any sense, so we must regroup one of the two tens such the 0 now...