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Mental Math Strategies
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Mental Math Strategies
Use mental strategies where you can. Show your thinking with jumps, number facts or short notes.
Mental calculation
1.Start at 46 and add 27 using jumps on the number line. Show a jump of 20 and a jump of 7, then write the total.
2.Work out 92 − 38 by rounding 38 up to 40, then adjusting your answer. What is the difference?
3.Use a double-and-halve strategy to find 18 × 5. Show the equivalent multiplication you use.
4.Complete the related multiplication fact, then use it to solve 168 ÷ 7: × 7 = 168, so 168 ÷ 7 = .
Choose and explain a strategy
5.Mei works out 58 + 36 by adding 30, then adding 6. Explain why splitting 36 into 30 and 6 gives the same total.
6.Estimate 397 + 206 by rounding each addend to the nearest hundred. Give your estimate and name the rounded numbers.
7.Which option is an efficient way to calculate 24 × 15 mentally?
- Double 24 × 15
- Calculate 24 × 10, then add half of 24 × 10
- Calculate 24 × 5, then subtract 15
Put your mental maths to work
8.A community fundraiser sells 164 raffle tickets in the morning and 138 in the afternoon. The next day, 45 fewer tickets are sold than the first day’s total. How many tickets are sold on the next day?
9.Talia has $240 and buys 3 board games for $28 each. First estimate how much money she has left by rounding $28 to $30. Then calculate the exact amount left.
10.Work out (54 ÷ 6) × (18 + 22) − 15. Show the order of your steps.
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