NumihanaLearn a method.
Learn how a calculation works, then try it yourself. Explore written methods, mental maths and soroban. Follow a worked example, then practise the steps. No sign-up is needed.
Written methods & mental maths
Build confidence with column calculations and flexible mental strategies.
Count on
Useful for adding a small amount. Use counters or a number line to keep track of the moves.
Learn and practise →Bridge through a multiple of ten
Useful when an addition crosses ten or twenty. If you already start on a multiple of ten, the bridging part is zero.
Learn and practise →Add tens, then ones
Useful for two-digit mental addition. Regrouping can happen when you add the ones.
Learn and practise →Subtract tens, then ones
Useful for two-digit mental subtraction with a non-negative result.
Learn and practise →Column addition
Useful for written calculations with several digits. An extra answer place may be needed.
Learn and practise →Column subtraction with exchanging
Useful for written subtraction, including exchanging through a zero placeholder.
Learn and practise →Multiply with equal groups
Useful for learning the meaning of multiplication and connecting repeated addition to a times-table fact.
Learn and practise →Long multiplication with partial products
Useful for written multiplication by a two-digit number, including zero digits.
Learn and practise →Divide by place value
Useful for written division by a two-digit divisor. The final remainder must be smaller than that divisor.
Learn and practise →Add equal-sized fraction parts
Useful for adding fractions with the same denominator. A simplified equivalent answer is accepted.
Learn and practise →Rename fractions before adding
Useful for adding unlike fractions. Multiplying the denominators always provides a common denominator, although a smaller one may also work.
Learn and practise →Near-base multiplication
Optional enrichment when both numbers are near the same power of ten. For other numbers, compare with partial products or long multiplication.
Learn and practise →Soroban
Learn to use an on-screen Japanese abacus, from setting numbers to complements and carrying. Start with the first lesson and work through in order.
Set numbers on a soroban
Optional enrichment for understanding place value and addition/subtraction. This is not a statutory teaching method.
Learn and practise →Read a soroban
Optional enrichment for understanding place value and addition/subtraction. This is not a statutory teaching method.
Learn and practise →Soroban addition without complements
Optional enrichment for understanding place value and addition/subtraction. This is not a statutory teaching method.
Learn and practise →Soroban subtraction without complements
Optional enrichment for understanding place value and addition/subtraction. This is not a statutory teaching method.
Learn and practise →Soroban complements to five
Optional enrichment for understanding place value and addition/subtraction. This is not a statutory teaching method.
Learn and practise →Soroban complements to ten
Optional enrichment for understanding place value and addition/subtraction. This is not a statutory teaching method.
Learn and practise →Soroban carrying between rods
Optional enrichment for understanding place value and addition/subtraction. This is not a statutory teaching method.
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