A friendly-number trickYear 4 Maths · T2 W11–12 · Home / H03

Access

Show, draw, type, sign, use your usual communication or direct an agreeing helper. Choose quiet/private work, switch a route, pause, pass or finish. One useful part is enough. A helper can read the exact words or scribe your choices; supplying an operation, count, regrouping or reason is mathematical help and is named. No speed, neatness, speech, handling or device requirement.

Day

53

Id

H03

Notice

Ordinary optional home practice, not unseen assessment or proof a child actually handled stock. Suggested 5–12 minutes, unpiloted; stop after a useful part.

Numbered moves

1. Read the stated source and choose paper, description or usual communication. Use 19+6 before 99+36.

2. Try one own way before the grown-up model. Keep your values and unit labels.

3. Grown-up separate practice possibility: Work 100+36−1=135; mark extra one; contrast about 100+40=140 with exact 135.

4. Receive one available explanation or check. Ask whether to keep, change, pause or finish; another example is optional.

Purpose

Tell someone why you put one back.

Routes

1. Instruction

   Use 19+6 before 99+36.

   Name

   A small beginning

2. Instruction

   Tell someone why you put one back. Use complete provided source and label the answer unit.

   Name

   Make the useful note

3. Instruction

   Choose a different whole count within 0–200 that keeps the result nonnegative. Restate all conditions and check the new result; the original worked answer cannot fill it.

   Name

   Change one condition

Complete source

An invented card set joins 99 and 36.

Title

A friendly-number trick