This worksheet and problem cards will help students deepen their understanding of addition and subtraction of decimals. (tes.com)
Effect of Number Family Instruction on Improving Fluency of Addition and Subtraction Facts in Japanese Second - Grade Students (scirp.org)
Children need a lot of practice with Math Facts so that they can progress from using various counting strategies through to the desired end result of having instant recall and mastery of basic Addition and Subtraction Math Facts. (gigglelearn.com)