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The male urinary tract shares the same kidneys, ureters and bladder, but has a longer urethra passing through the prostate. Label each part in an interactive playground.

To work out a power of a whole number, multiply the base by itself as many times as the exponent says: 3²=9, 2³=8, 5²=25. Compute four powers and land each on its value in an interactive playground.

An exponent is shorthand for repeated multiplication: 2⁴ means 2 × 2 × 2 × 2 = 16. Label the base, exponent, repeated multiplication and value on a worked power, in an interactive playground.

The thyroid is a butterfly-shaped neck gland that makes a hormone controlling how fast your body works. Label its two lobes and isthmus, the voice box and the windpipe, in an interactive playground.

Each kidney filters blood into urine. Label the capsule, cortex, renal pyramid, renal pelvis and ureter on a cut-open kidney, in an interactive playground.

The bladder is a stretchy muscular bag that stores urine. Label the ureters, ureter opening, muscular wall, the folds (rugae) and the urethra, in an interactive playground.

The absolute value of a number is its distance from zero, so it is never negative and −5 and +5 are both 5. Learn the fold-at-zero idea, then match each number to its distance in an interactive playground.

Saliva is made by three pairs of salivary glands — parotid, submandibular and sublingual. Label each gland, the tongue and the teeth, and learn what spit does, in an interactive playground.

Tiny clusters in the pancreas make insulin and glucagon. Label the islet, its beta and alpha cells, the digestive-juice cells and a capillary, and learn how blood sugar stays balanced.

The breast is a mammary gland: milk-making lobules, ducts to the nipple, and fat for shape, on the chest muscle and ribs. Label each part and learn how the breast makes milk.

Each adrenal gland has a capsule, a cortex that makes cortisol and a medulla that makes adrenaline. Label the capsule, cortex, medulla, artery, central vein and nerve.

Up close the adrenal gland is layered: three cortex zones over the medulla, each making a different hormone. Label the four layers and match each to its hormone.

Adding a negative number moves you to the left on the number line. Learn the jump-left rule, then solve four sums by jumping to the answer in an interactive number-line playground.

Subtracting a negative number moves you to the right on the number line — two minuses make a plus. Learn the rule, then solve four sums by jumping to the answer in an interactive number-line playground.

Multiplying negative numbers follows two sign rules: different signs make a negative, same signs make a positive. Learn why a negative times a negative comes out positive, then land four products on the number line.

Dividing negative numbers uses the same two sign rules as multiplying: different signs make a negative answer, same signs make a positive one. Land four divisions on the number line to practise.

A negative number is a number to the left of zero on the number line. Meet the number line — zero in the middle, positives to the right, negatives to the left — and practise placing negative numbers by counting steps from zero, in an interactive playground.

A tooth is far more than the white bit you brush. Cut one open and label the enamel, dentin, pulp, gum, jawbone and the nerve that feeds it — and learn what each part does, and why a cavity starts painless but ends agonising, in an interactive playground.

The tongue is a muscle whose surface is covered in tiny bumps that hold your taste buds. Label the tip, root, papillae, the large taste bumps and the midline groove, and learn what each part does, in an interactive playground.

Taste happens inside tiny onion-shaped taste buds packed into the tongue. Label the taste bud, its taste cells, the taste pore, the nerve fibre and the surrounding surface, and learn how dissolved food becomes a flavour signal to the brain, in an interactive playground.