The bar model method is one of the key problem solving heuristics that students use to solve word problems in Singapore maths. It falls under the heuristic “draw a picture”.

There are two main types of bar models, the part-whole model and the comparison model.

**1. Whole Number (P4)**

Jimmy has 364 more cards than Tim. If Jimmy gives 210 cards to Tim, how many more cards does Tim have than Jimmy in the end?

**2. Fractions (P5)**

At a party, 1/2 of the adults is equal to 2/5 of the children. If there are 279 people altogether, how many children are there?

**3. Decimals (P4)**

2 teachers and 6 pupils visited a zoo. Each teacher paid $24.60 and each pupil paid 1/3 of the amount for the entrance fees. How much did they pay altogether?

**4. Ratio (P6)**

A a school concert, 1/5 of the audience was adults and the rest was children. There were 567 more children than adults. The ratio of the number of boys to the number of girls was 2:7. How many girls were there at the concert?

**5. Percentage (P6)**

At a Family Day event, 25% of the participants were parents. There were 84 more boys than parents who participated. The remaining 166 participants were girls. How many participants were there altogether?