Solving Simple Equations with a Balance
Ellie the elephant solves 3x + 4 = 19 on a pan balance: take 4 from both sides to get 3x = 15, then divide both sides by 3 to find x = 5. Learn to keep an equation balanced by doing the same to both sides, solve 2y − 3 = 11 yourself, and check your answer by putting it back in.
Watch next
1:58Sharing in a Ratio
Pip the panda and Rosie the rabbit share 20 strawberries in the ratio 2 : 3. A bar model shows the three steps: add the parts, find one part, multiply. Then share £35 in the ratio 3 : 4 and check that the answers add back up.
1:50Proportion: Scaling Recipes Up and Down
A pancake recipe for 4 people uses 200 g flour, 2 eggs and 300 ml milk. Bruno the bear needs enough for 6, so he finds the amount for 2 people first (halve it), then multiplies by 3. Then scale a recipe for 6 down to 4 yourself, and learn the "find one first" method.
1:58Map Scales and Scale Factors
On Leo the lion’s map, 1 cm stands for 2 km. Learn to use a map scale to turn a 6 cm measurement into a real distance of 12 km, and see how a scale factor makes every length of a shape bigger by the same amount. Then work out a real distance with a scale of 1 cm to 5 km yourself.