# Mental +/- to 100

## Difference

Demonstrate finding the difference in a variety of ways using this versatile number line

Find the difference number lines bridging 10          1U – U A          1U – U B

Find the difference number lines bridging next multiple of 10          TU – TU A          TU – TU B

Find the difference number lines bridging several multiples of 10          TU – […]

## Facts Grid

Press different squares to reveal numbers and complete the missing spaces in the grid

Number Grid answers up to 10          U + U          U + U with inverse

Number Grid          U + U          U + U with inverse

Number Grid          U – U          U – U with inverse

Number Grid          1U + U          1U + U with inverse

Number Grid          1U – U          […]

## Spinners

Spin the spinners and complete the mental calculations

2 spinners U + U          A          B

2 spinners subtraction with numbers up to 10          A          B

2 spinners 1U + U          A          B

2 spinners subtraction with numbers up to 20          A          B

2 spinners 1U + 1U          A          B

2 spinners subtraction with numbers up to 30          A          B

2 spinners TU + TU with answers […]

## Bricks

Practise mental addition skills and inverse relationships to solve a variety of problems

Three brick addition with base numbers          up to 4          not crossing 10          not crossing 10 including inverse

Three brick addition with base numbers          single digit numbers crossing 10          single digit numbers crossing 10 including inverse

Three brick addition with base numbers          up to 20          up to […]

## Subtraction Bingo

Fun way to practice a range of mental subtraction calculations

## Complements Bingo

Fun way to practice quick recall of making different amounts

Nrich Maths          Pairs of Numbers

Fun way to practice a variety of mental addition strategies

## Inverse Machines

Great visual resource for understanding inverse relationships

U + U          A          B

TO + U          A          B

TU + U          A          B

TO + TO          A          B

TU + TO          A          B

TU + TU          A          B

O.t + O.t          A          B

U.t + U.t          A          B

## Magic Squares

Solve a variety of different random puzzles or set your own totals using this magic square interactive

Magic Squares

1 2 3 Magic Square

Not at All Magic Squares

Not so Magic Squares 9 – 15          four clues          two clues          no clues

Not so Magic Squares 18 – 24          four clues          two clues          no clues

Not so Magic Squares          9 problem     […]

## Function Machine 2

Explore 1 and 2 step function machines in a variety of ways using this very flexible resource