Stage 9 · Mixed operations
Grandmaster mix
Pick the fastest route on the spot.
How to do it
Method
Pick the fastest route on the spot
43 × 11: 4 + 3 = 7 → 473
Another way
Column multiplication
43 × 11 = 430 + 43 = 473
In full
No cues, no pattern, every technique in play. At this level the skill isn't how many facts you remember — it's picking the fastest route on the spot.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
(48 ÷ 4) × 4
Show the answer and working
Answer: (48 ÷ 4) × 4 = 48
(48 ÷ 4) × 4: brackets first, 48 ÷ 4 = 12, 12 × 4 = 48
Example 2
(20 ÷ 2) × 8
Show the answer and working
Answer: (20 ÷ 2) × 8 = 80
(20 ÷ 2) × 8: brackets first, 20 ÷ 2 = 10, 10 × 8 = 80
Example 3
28 × 11
Show the answer and working
Answer: 28 × 11 = 308
28 × 11: split 2 and 8, the middle is 2 + 8 = 10, which carries: 2 + 1 = 3, 0 in the middle → 308
Example 4
99 × 93
Show the answer and working
Answer: 99 × 93 = 9207
99 × 93: 99 is 1 short of 100, 93 is 7 short. Front 99 − 7 = 92, back 1 × 7 = 7, the back is always two digits: 7 is written 07, front then back → 9207
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