Addition Children build the number sentence using concrete equipment.

5+3= Addition Step 1: Build number sentence with concrete equipment. Step 2: build one part Step 3: build the second part Step 3: count and check to find the whole number 5+3=

Children use knowledge of number bonds to make 10. Addition 8 +2 = 10 Children use knowledge of number bonds to make 10.

Addition Try: 13+4= 15+3= 12+6=

Addition

Addition with regrouping the ones Step 1: Build number sentence with base ten. Step 2: First add the ones. Step 3: Regroup the ones into tens and ones. Step 4: Add the tens Step 5: Add the hundreds 127 + 136 = 225 + 155= 129 + 127= Now try: 168 + 157=

Subtraction Try: 9 – 4 = 6 – 2 = 8 – 5 = 10 – 4 =

Subtraction Try: 19 – 8 = 16 – 2 = 18 – 5 = 17 – 4 =

Subtraction Try: 28 – 8 = 37 – 12 = 45 – 11 = 22 – 10 =

Subtraction with regrouping the tens and the ones Step 1: Build number sentence with base ten. Step 2: Regroup the tens and ones. Step 3: First subtract the ones. Step 4: Subtract the tens. Step 5: Subtract the hundreds 334 - 116 = 275 - 149= 311 - 107= Now try: 222 - 157=

Subtracting Numbers with 0s in 2000 – 257 = Concrete Pictorial Abstract Using the denes blocks to regroup Using drawings to represent the numbers Using the column subtraction with numbers and symbols

Subtracting Numbers with 0s in Thousands Hundreds Tens Ones Step 1: Exchange one thousand for ten hundreds

Subtracting Numbers with 0s in Thousands Hundreds Tens Ones Step 2: Exchange 1 hundred for 10 tens

Subtracting Numbers with 0s in Thousands Hundreds Tens Ones Step 3: Exchange 1 ten for 10 ones

Subtracting Numbers with 0s in Thousands Hundreds Tens Ones Now we have exchanged, we can now calculate it.

Subtracting Numbers with 0s in 1 9 9 1 1 1 2000 - 257 Thousands Hundreds Tens Ones 1 7 4 3 Step 4. Now subtract 257 from the number above. ( Ones first, then tens, hundreds and thousands )

Subtracting Numbers with 0s in Thousands Hundreds Tens Ones 2000 - 147 Now you try…. 1. Make 2000 2. Regroup ( Exchange ) the thousands, hundreds and tens 3. Then subtract 147

Understanding Decimals Thousands Hundreds Tens Ones Tenths Hundreths