Decimal Operations Lab
A shopkeeper adds, subtracts, and multiplies decimal quantities while keeping the decimal point aligned.
Line up the decimal points before calculating.
A shop weighs 0.645 kg of rice and 0.390 kg of beans. Learners combine the masses and explain the decimal places.
Decimal Operations Lab illustration
A shopkeeper adds, subtracts, and multiplies decimal quantities while keeping the decimal point aligned.
Add 0.645 and 0.390.
- Write the decimal points in one column.
- Add 645 thousandths and 390 thousandths to get 1.035.
Struggle support
Rescue lab
Decimal grid before algorithms
Learners shade thousandth parts before writing a vertical sum.
Use columns labelled ones, tenths, hundredths, and thousandths.
Line up the decimal grid columns.
Use real objects or counters before any written shortcut.
Combine or remove matching place-value parts.
Draw the model so each group, part, or place can be seen.
Write the vertical algorithm with decimal points aligned.
Write the equation only after the visual model is stable.
Starting with a rule before identifying what each object represents.
Ask the learner to point to the unit, group, or column in the picture.
Name the unit first, then rebuild the written statement from the model.
Copying digits or symbols without keeping place value or units attached.
Ask which place, unit, or event each number belongs to.
Write labels beside the numbers before simplifying the answer.
Shade decimal parts on a grid before adding or subtracting.