🔁 Show me another way
1.46 + 1.38 and 1.2 × 1.3, each solved three ways. Same answer every time. Pick the way that clicks for you.
🍎 For teachers and families: all three ways reach the same standard
New York State standard NY-5.NBT.7:
Using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between operations: • add and subtract decimals to hundredths; • multiply and divide decimals to hundredths. Relate the strategy to a written method and explain the reasoning used.
Source: New York State Education Department, Next Generation Mathematics Learning Standards, Grade 5 Crosswalk.
The base-ten pieces, the hundredths grid and break apart show why the written method works: the same pieces (hundredths, tenths, ones) are added or multiplied in all three, and the standard way writes them one digit per place. The standard asks learners to relate the strategy to a written method, so the practice ends in the learner's class way, or in the standard way when the learner is not sure. Answers like 2.8, 2.80 or 2,80 are all accepted. This page covers addition and multiplication; subtraction and division are in the lessons.
These ways are general mathematics. Goal100 wrote and drew them; nothing is copied from any publisher's program. Goal100 does not say which program your school uses: the learner picks by picture. Progress stays on this device.