Place Value Subtraction (Base Ten Blocks) app for iPhone and iPad

Place Value Subtraction builds on the previous Apps, Place Value Addition and Place Value Counting. This App compliments the use of hands on experiences for modelling subtraction problems using blocks in instances when using real blocks is not practical.


•Teaching Module
Contains place value chart, units, longs, flats and blocks, basket for trading and regrouping, counter feature. This module is for teachers to create their own learning experiences or for students to use when solving written problems, instead of using real blocks. Students place ten objects in the basket to make or one object to break. Make label appears when ten objects have been placed in the basket and Break label when one object is placed in the basket.


•Learn to rename
This game addresses the need to teach and learn how to rename blocks. That is, 3 tens and 5 ones (35) is equal to 2 ten and 15 ones (also 35!) This skill is important in knowing why renaming can be used, rather than just knowing the how of renaming. Blocks are set out on the floor, each question will dictate what type of renaming is to be completed. Use the basket to rename, then place the blocks on the place value chart. Place check to answer. If you want to be shown how to rename, press the show me button for a demonstration.


•Subtraction no renaming - 4 levels
Use the blocks to complete the subtraction problem, placing the higher number on the place value chart and moving away the blocks to the bottom section of the place value chart, counting what remains, then typing the answer on the keypad. Levels of difficulty can be changed the up and down arrow buttons. No regrouping required in this activity as a precursor to the following task.


•Subtraction with renaming - 5 levels
Use the blocks to complete the subtraction problem, placing the higher number on the place value chart, moving blocks to subtract the lower value, use the basket to change blocks to rename to the required place value, then type the answer on the keypad. Levels of difficulty can be changed the up and down arrow buttons. Task appears similar to previous challenge but with renaming in all levels.

•Track the progress of each user for parents and teachers to evaluate a childs progress.